Chelsea were punished for a profligate showing at Borussia Dortmund after Karim Adeyemi's second-half strike secured a slender 1-0 lead in the Champions League last 16.

Graham Potter's side will have home advantage in the return match at Stamford Bridge on March 7 but left Signal Iduna Park ruing missed chances on Wednesday.

Joao Felix spurned a pair of glorious first-half opportunities in an entertaining encounter in Germany, before Adeyemi's 63rd-minute goal inflicted further misery on Chelsea after a ruthless counter-attack.

The Blues still have the chance to turn the tie on its head, but Potter and his men cannot afford similar struggles in front of goal in the second leg in west London.

Thiago Silva had the ball in the back of the net after 16 minutes, only to see the goal ruled out and the centre-back cautioned for a seemingly intentional handball past Gregor Kobel.

Chances continued to flow in a frenetic first half as Marius Wolf sliced a golden opportunity wide and Sebastien Haller fired narrowly off target from a presentable opening.

Joao Felix wastefully blazed over before hitting the crossbar after a driving run, while Wolf arrowed just wide with Kepa Arrizabalaga scrambling.

Kobel produced an expert stop to deny Reece James' pinpoint free-kick after the interval, before the Dortmund goalkeeper thwarted a bouncing volley from the England right-back soon after.

Adeyemi was clinical when Dortmund broke from the resulting corner, released by Raphael Guerreiro and powering past Enzo Fernandez before rounding Kepa to score.

Emre Can then cleared off the line after Kalidou Koulibaly's effort squirmed under Kobel, who kept Dortmund's narrow lead intact with a fine stop from Fernandez in the final minute.

What does it mean? Advantage Dortmund

Dortmund defeated an English side in European competition for the first time in 11 attempts, although their first such victory since March 2016 – against Tottenham – came with a degree of fortune.

Potter will wonder what his Chelsea side must do to get past Kobel in the return meeting after Joao Felix's pair of misses came back to haunt the Blues on the road.

A repeat performance at home may be enough to down Dortmund, but Potter's men cannot bank on having such a plethora of chances again as they stare down the barrel of an early European exit.

Adeyemi the difference

While the brilliant Brandt created four chances in a productive display, Adeyemi will steal the headlines for his remarkable goal on the break.

The 21-year-old has scored in each of his last three competitive appearances – one more than in his first 20 games for BVB.

Havertz's Dortmund wait goes on

Kai Havertz has repeatedly been trusted by Potter to lead Chelsea's line, but the Germany international suffered a familiar fate against BVB.

The forward managed to create four chances and also attempted four shots, but he has now played eight games against Dortmund without scoring – more than against any other opponent in his club career. He has lost all five away games against Dortmund.

What's next?

Chelsea return to Premier League action at home to Southampton on Saturday, while Dortmund host Hertha Berlin the following day in the Bundesliga.

Graham Potter rounded on former players who have questioned his experience and edge as the Chelsea boss insisted he chooses the right moments to show anger.

Former England stars Rio Ferdinand and Joe Cole have been among those to speak out about Potter's leadership.

Both expected a more forceful response from the former Brighton and Hove Albion head coach after Chelsea were denied a penalty at the weekend when Conor Gallagher's shot hit the arm of Tomas Soucek in a 1-1 draw at West Ham.

Cole said there should have been someone on Potter's staff to "cause a bit of an uproar", while both men suggested Potter missed a chance to lay the blame for a disappointing result at the door of the match officials, thereby taking heat off his struggling team.

Ferdinand suggested the likes of former Blues boss Jose Mourinho, plus Pep Guardiola and Jurgen Klopp, would have swiftly jumped at a chance to deflect incoming criticism.

Their verdicts on BT Sport came as Potter gave a reasoned reaction to the broadcaster, saying Chelsea needed such things to go for them, adding there was "nothing to complain about there".

Asked about whether he shows anger and in what circumstance, Potter addressed the matter on the eve of his team's Champions League last-16 clash with Borussia Dortmund.

"Of course I get angry. I'm a human being just like you," he told reporters in Tuesday's press conference. "It's just I choose to conduct myself the way I think is the right way to conduct myself on the side.

"That's not to say we don't all lose our temper, because we do, because it's an emotional thing, but I think I have a responsibility to myself, to Chelsea and the game to act in a way that I think is the right way for me; not for anyone else, for me.

"if you think you can start a coaching career in the ninth tier of English football, in the Northern Counties Division One, and get to this point now with Chelsea in the Champions League without getting angry or being nice, then I would suggest you don't know anything about anything."

Potter said the Dortmund away game on Wednesday would be a "wonderful occasion" and he is "really excited for it".

He also spoke about perceived problems between Mykhaylo Mudryk and Marc Cucurella, with reports claiming new signing Mudryk gave a 'like' on Instagram to a post critical of the Chelsea left-back.

They need to forge an alliance on the flank if Chelsea are to blossom, and Potter looked to defuse the situation, saying: "There's no problem in terms of anything sinister at all.

"If anything, it's just team-mates understanding each other. It's quite a common problem: when to pass and at what point and what time.

"There's no problem, it's more just an understanding challenge, which is quite easy to understand when you recognise the context we're in."

Potter added: "We've got a squad we're really excited about, but we know there are challenges and work you have to do. If all of us started working together we'd have to take some time, understand each other, understand what makes us tick and understand how we can help each other.

"That's the impression I get when I see the boys on a daily basis: good spirit, good harmony. They're pushing each other in a good way."

Potter knows Chelsea's vast spending spree, in the region of £600million since Todd Boehly came in as owner, means they have to perform at a high level.

"Of course there's more pressure and expectation when you spend money," he said.

He spoke of how it was difficult to see any club sweeping to consistent trophy success without major investment, but suggested five per cent might find a formula without lavishing huge sums in the transfer market.

"It's like warfare," Potter said. "Sometimes guerrilla warfare can win. You don't have to have the big guns and the big ammo, but sometimes it helps as well."

The second set of Champions League last-16 fixtures to take place this week is full of intrigue, with the continent's biggest-spending club of the January transfer window in need of a result.

Graham Potter's Chelsea forked out an estimated £291million to reshape their squad last month, but the misfiring Blues have won just one of their eight games this calendar year. 

For all his struggles on the domestic front, Potter has yet to suffer a Champions League defeat with Chelsea, and maintaining that record at Borussia Dortmund would give them an excellent chance of reaching the last eight.

Potter is not the only under-fire English boss to take centre stage on Wednesday, with former Fulham and Bournemouth head coach Scott Parker overseeing Club Brugge's clash with Benfica.

With just one win in nine games since the World Cup, Brugge will be considered outsiders against the Lisbon giants, who were outstanding as they finished above Paris Saint-Germain and Juventus in Group H.

Stats Perform has taken a look at the key Opta numbers ahead of Wednesday's first-leg match-ups. 

Borussia Dortmund v Chelsea

Somewhat surprisingly given their statuses as European regulars, Dortmund and Chelsea will do battle for the first time in continental competition on Wednesday.

The omens are not particularly good for either side, as a BVB team without a win in their last 10 European meetings with English opponents (D2 L8) face a Chelsea side with just three victories in 11 previous away games in Germany (D3 L5).

Dortmund's last win over Premier League opponents came against Tottenham in the Europa League in 2016, with current Chelsea striker Pierre-Emerick Aubameyang netting twice in a 2-1 triumph.

Aubameyang will not be welcomed back by the yellow wall on Wednesday, however, having been left out of Chelsea's Champions League squad following their huge spending spree.

Instead, Germany international Kai Havertz may lead the line as he bids for a first career goal against BVB – his seven appearances without netting against Dortmund are more than he has managed against any other club.

Dortmund, meanwhile, could hand Sebastien Haller his first Champions League appearance for the club following his recovery from testicular cancer. The former Ajax man has more goals in his first eight games in the competition (11) than any other player.

Additionally, Haller has averaged a goal every 61 minutes of Champions League football, the best ratio in the competition's history (minimum 250 minutes played).

Should Chelsea keep Haller quiet en route to victory, Potter would become the first English manager to win five consecutive Champions League matches, with a 1-1 draw against Salzburg in his first game at the helm the only blot on his European record with the Blues.

Club Brugge v Benfica

Two of the group stage's surprise packages meet in Belgium, with Brugge having escaped Group B at the expense of Bayer Leverkusen and Atletico Madrid, while Benfica bested PSG and Juventus.

Brugge boss Parker has struggled since replacing Carl Hoefkens, but he will join an exclusive club on Wednesday as just the third English coach to lead a non-English team in the Champions League, after Bobby Robson (Porto and PSV) and Gary Neville (Valencia).

In Parker and Potter, meanwhile, two different English managers will coach in the same Champions League campaign for the first time in the competition's history.

Benfica are sure to make things difficult for Parker's team. The Portuguese giants are unbeaten in their last seven Champions League games (W4 D3) and are chasing three consecutive wins in the competition for the first time since the 2005-06 campaign.

In the group stage, Benfica generated more shots (14) and scored more goals (five) following high turnovers (open-play sequences starting within 40 metres of the opponent's goal) than any other team, showing their devastating counter-attacking abilities.

Benfica also have the highest conversion rate of any team, netting with 20 per cent of their shots in the Champions League this term (16/80).

Home goalkeeper Simon Mignolet, then, could be in for a busy outing. Fortunately for Brugge, he has prevented more goals than any other goalkeeper in the Champions League this season (6.3) – being beaten four times from 10.3 expected goals on target faced.

Graham Potter has acknowledged the need for Chelsea to snap out of their frustrating run of form quickly, saying: "long-term doesn't exist in this job".

Potter has come under pressure amid a difficult period for the big-spending Blues, who recorded three successive Premier League draws for the first time since 2012 after Saturday's 1-1 stalemate with West Ham.

Chelsea have won just one of their eight games across all competitions since the turn of the year (D4 L3), and the Champions League now represents their only chance of avoiding a trophyless season.

With a trip to Borussia Dortmund for the first leg of an enticing last-16 tie on the horizon, Potter is aware of the need for things to change at Stamford Bridge.

"You can't talk about the long-term because that doesn't exist in this job," he told reporters. 

"You have to acknowledge there's a long-term but there's a short-term and medium-term that is challenging for us in terms of results.

"The experienced players know what we've been through. You're talking about some top professionals who know football. 

"While people on the outside may have an opinion on things, these guys have been around and know the challenges we've faced.

"They know the situation the club has been in and what's happened. So then it's about helping them get through it, the inevitable frustration because they want to win. We all do and the supporters do. That's where it's been challenging."

Chelsea's two previous Champions League titles were delivered during campaigns which saw them struggle in the Premier League, and while Potter is excited by the start of the knockout stages, he is taking things game by game.

"In a knockout competition, anything can happen, that's the thing," he said. "It's two games. I don't think it's valuable for us to look past Dortmund.

"We have the capability to beat Dortmund but they are also a strong side with the capability to get a result as well. We have to understand that, go to Dortmund with humility, with respect, and try to get the result.

"[This squad] has won the Champions League. They've experienced it. They'll want to fight for the game, that's for sure, and that's exciting for us."

Despite Chelsea's domestic struggles, Potter is unbeaten in his five Champions League games at the helm, winning the last four.

Victory in Dortmund on Wednesday would therefore make Potter the first English coach to win five successive matches in the competition. 

Arsenal and Brighton and Hove Albion were victims of "significant" human errors during Saturday's Premier League action, according to the body responsible for match officials in English football.

Ivan Toney equalised against the Gunners at Emirates Stadium to ultimately secure Brentford a 1-1 draw, but the goal should not have stood due to Christian Norgaard – who nudged the ball across goal for the assist – having previously been in an offside position.

VAR Lee Mason failed to spot it despite the goal going to a review to check if Ethan Pinnock had been offside.

Also on Saturday, Brighton were denied a winning goal when Pervis Estupinan had his strike ruled out for offside – the VAR seemingly deemed the wrong Crystal Palace defender to be the deepest player.

The Professional Game Match Officials Limited (PGMOL) admitted there were mistakes.

A statement read: "PGMOL can confirm its chief refereeing officer Howard Webb has contacted both Arsenal and Brighton and Hove Albion to acknowledge and explain the significant errors in the VAR process in their respective Premier League fixtures on Saturday.

"Both incidents, which were due to human error and related to the analysis of offside situations, are being thoroughly reviewed by PGMOL."

PGMOL did not comment on the controversy that occurred at London Stadium, however, where Chelsea were denied a late penalty when West Ham's Tomas Soucek handled the ball in the box.

Chelsea boss Graham Potter sarcastically praised Soucek for a "good save" after the game.

Chelsea head coach Graham Potter sarcastically commended West Ham's Tomas Soucek for a "good save" that mystifyingly did not lead to a penalty in Saturday's 1-1 draw.

Former Chelsea defender Emerson Palmieri cancelled out Joao Felix's opener at London Stadium before the VAR took centre stage.

First, the technology came to Chelsea's rescue in the 82nd minute as Soucek tapped in a rebound, the goal disallowed due to Declan Rice being offside with the initial headed effort.

Then, Chelsea were convinced they were due a penalty as Soucek blocked Conor Gallagher's effort with his hand in the area.

According to reports, PGMOL – the body responsible for match officials in English football – has since said the decision was correct because it perceives Soucek's arm to have been outstretched to break his fall.

The incident did not go to a VAR review as referee Craig Pawson's decision was deemed satisfactory, and although Potter was initially surprisingly calm about the controversy, he could not resist a pop or two in his post-match press conference.

"I thought it was a good save so you need your goalkeeper sometimes to get you the points," he told reporters.

"It hasn't been given so there's nothing for me to say. I've only seen it briefly as I walked across. It looks like one of those where if it was given, I don't think it would be overturned but it hasn't been given, so I don't know."

He added: "It looked quite a handball to me. I didn't know Tomas could get down that easily and save like that. It's a good stop from him. It's not for me to say about VAR."

Potter was then asked if he just wanted more consistency with such decisions, but the Chelsea boss was sceptical about that even being possible.

"You won't [get consistency] because they're human beings," he said of the VAR officials.

"A different human being in the room and every single decision and action, you won't get the same one again, so it's very hard to get consistency.

"Sometimes they go for you, sometimes they don't. You just have to accept that."

The draw leaves Chelsea ninth in the Premier League.

Graham Potter thinks Chelsea were falsely denied a late penalty in Saturday's draw with West Ham, but the head coach refused to openly call out the officials.

The Blues were held to a 1-1 draw at the London Stadium, with former Chelsea defender Emerson Palmieri cancelling out Joao Felix's opener.

VAR then came to Chelsea's rescue in the 82nd minute as Tomas Soucek tapped in a rebound, the goal disallowed due to Declan Rice being offside beforehand.

But Chelsea were adamant they should have then been given a penalty soon after, as Soucek blocked Conor Gallagher's effort with his hand.

The incident did not go to a VAR review, with referee Craig Pawson's decision ultimately final despite it looking a glaring error.

Potter did not appear as angry as some might have expected, however.

"It looks it [a penalty] but these are the little things you need to go in your favour and at the moment they are not, so that's life," he told BT Sport.

"There is nothing to complain about there. We have to keep working. There were positives and some good attacking moments from players who are adapting to the Premier League.

"That's where we're at. We just have to keep moving forward."

Joao Felix was making his return after receiving a red card on his debut last month, while fellow new arrivals Mykhaylo Mudryk and Noni Madueke joined him and Kai Havertz in attack.

The first 25 minutes were arguably as fluent as Chelsea have ever been in the league since Potter's appointment in September, with Joao Felix at the centre of many of their most threatening passages of play.

Enzo Fernandez also caught the eye in midfield, with his sumptuous cross teeing up the 16th-minute opener, and Potter felt there were certainly positives to take in despite the disappointing result, a third successive league draw that leaves them ninth.

"I think you saw the potential in the first half," he said to BBC Sport. "You can't control what people say from the outside, you see it how it is and carry on working.

"They are a good group and we are excited with the team and the potential, but it is still a work in progress.

"The second half was more of a reflection of where we are in terms of integrating new players and getting players up to speed in the Premier League."

On Fernandez, he added: "It is his second game. He is a young player but you can see his quality and his personality.

"Like Joao Felix, Madueke and Mudryk, he will get better the more we understand them and they understand us. It is a process that you can't really short circuit."

Chelsea now turn their attention to the Champions League with a trip to Borussia Dortmund up next on Wednesday.

Off the pitch, 2023 has offered plenty of excitement for Chelsea supporters. However, the same cannot really be said for the on-pitch fare being served up by Graham Potter's men this year.

The Blues' return of six points and three goals from six Premier League games since the turn of the year is hardly commensurate with their estimated £291million outlay in the January transfer window, and they need to turn a corner soon.

West Ham are in similar need of an upturn, with David Moyes' side just one point clear of danger and embroiled in a tense battle to beat the drop.

That means there is plenty at stake for both as Chelsea travel for Saturday's derby meeting with the Hammers, and there is certainly no love lost between the London rivals.

Stats Perform picks out the standout Opta numbers ahead of a game that both West Ham and Chelsea will hope marks a turning point in their disappointing seasons.

Chelsea bid to end goalscoring blues

Having followed up a 1-0 home victory over Crystal Palace with 0-0 draws against Liverpool and Fulham, Chelsea are looking to avoid making unwanted history on Saturday.

Chelsea could record three successive goalless draws for the first time in their league history next time out, with their plethora of big-money arrivals so far failing to click in the final third.

Last week's stalemate against Fulham represented the 17th goalless draw Potter has overseen since the start of his first Premier League campaign in 2019-20 – more than any other boss during that run.

Those hoping Chelsea's opponents step up to provide the entertainment may be disappointed. West Ham have underperformed their expected goals figures by almost 10 goals this season (18 goals from 27.9 xG) – the biggest negative difference in the Premier League this term.

Can Joao Felix lead the way?

Chelsea will hope the solution to their goalscoring issues is provided by Joao Felix's return to action, with the Portugal international eligible once again after last month's debut red card against Fulham led to a three-match ban.

Joao Felix has never scored more than 10 goals or contributed more than five assists during a single season for parent club Atletico Madrid, but there are signs he could evolve into a more prolific player at Chelsea.

The 23-year-old was averaging a goal involvement every 120 minutes for Atleti this season prior to being loaned out, his best figure since joining the Spanish giants in 2019.

Joao Felix also averaged a goal every 191 minutes for Rojiblancos this campaign, a ratio not bettered by any Chelsea player in the Premier League this term. 

Hammers chase rare derby delight

West Ham have not garnered much enjoyment from their recent meetings with cross-city rivals.

The Hammers have lost eight of their last 10 London derbies in the Premier League, the exceptions being a draw against Tottenham and a win over Fulham, though both of those results came this season.

However, West Ham have alternated between winning (four times) and not winning (D1 L2) in their last seven home Premier League games against Chelsea, and the teams' last meeting at the London Stadium saw Arthur Masuaku hit a late winner for the hosts in December 2021.

If that represents a negative omen for the hosts, Chelsea could be set to make history – victory would make the Blues the first team to win 150 London derbies in the Premier League. 

Late drama incoming?

No Premier League fixture can lay claim to containing the levels of late drama witnessed in meetings between these two teams.

There have been seven winning goals scored in the final five minutes of Premier League games between West Ham and Chelsea, more than in any other fixture in the competition's history.

The last three meetings between the teams have been settled by a goal scored in the final five minutes, with Kai Havertz doing the honours 88 minutes into September's return fixture at Stamford Bridge.

Christian Pulisic was the last-minute hero as the Blues also edged the previous clash last April, and given their recent shortcomings, the visitors will not mind if they are made to wait again on Saturday. 

Graham Potter is hopeful Joao Felix can make a difference for out-of-form Chelsea on his return from suspension at West Ham, acknowledging his raft of new signings must gel quickly.

Joao Felix arrived on loan from Atletico Madrid last month and initially impressed on his debut at Fulham, though a rash challenge on Kenny Tete saw him sent off 58 minutes into the Blues' 2-1 defeat.

That made him the first player to be dismissed on his Premier League debut for Chelsea, and Potter's men have struggled for attacking inspiration during his subsequent three-match ban.

After beating Crystal Palace 1-0 in their next game, Chelsea laboured to goalless draws with Liverpool and Fulham – they have never drawn three successive league matches 0-0 in their history.

Speaking ahead of Saturday's short trip to face London rivals West Ham, Potter highlighted Joao Felix's positive performances in training. 

"I think we all saw the impact he had in his hour before the red card," Potter recalled of his debut. "You can see his quality, we see it every day. 

"He's a player that can make a difference for us. It's about helping him to get integrated into the team, but the signs are really positive."

The Portugal attacker has since been joined by more big-name arrivals at Stamford Bridge, with Chelsea investing heavily to acquire Mykhaylo Mudryk, Enzo Fernandez and others.

Asked how patient he could afford to be with his new players, Potter said: "It's my job. When you're coaching players, there is a process to go through and you have to understand the context.

"I'm not stupid, at the end of the day, if the results aren't what this club should get, and if I'm the reason for it... then that's the job.

"In the meantime, I have to go through the process of working with the players, helping them improve. 

"It's a complicated situation at the moment, but I'm really looking forward to the challenge that awaits us. I don't worry about the absolute timescale of it all."

Reports have suggested Chelsea could help to balance their incomings by letting Pierre Emerick-Aubameyang depart for Major League Soccer outfit Los Angeles FC, but Potter says there is "nothing to report" on that front.

"He's been training with us this week, conducting himself well," Potter added. "He has been supporting his team-mates and while he is here, he is doing exactly what I expect him to do."

Potter was also asked about this week's announcement that Manchester City have been charged with breaching the Premier League's financial regulations, but he was careful to stress the champions remain innocent until proven guilty. 

"I don't know anything about it, we focus on ourselves. It's something Manchester City have to deal with," he said.

"As I understand it, they're just charges. Certainly in this country, you're innocent until you're proven guilty, so it's not for me to comment on it."

Chelsea have hired the All Blacks mind coach who introduced a "no d***heads" policy as Graham Potter looks to turn the Blues into winners.

Heavy investment in players since Todd Boehly came in as owner has not yet been followed by success on the pitch, with Chelsea a disappointing ninth in the Premier League.

Thomas Tuchel was sacked in September and his replacement, Potter, is battling to prove he can be the coach to deliver strong results and trophies to Stamford Bridge.

Now Gilbert Enoka is heading to the London club after making an impressive impact in rugby union with New Zealand over the past 20 years.

Enoka, who stepped up from being mental skills coach to become leadership manager with New Zealand, will join up with Chelsea on what New Zealand said was a "short-term consultancy basis".

The incoming expertise should be a boost to Potter, with the widely acclaimed Enoka having been part of an All Blacks set-up that won Rugby World Cup titles in 2011 and 2015.

Chelsea have spent around £600million on new players in the past two transfer windows, without their sprees having had any obviously positive effect on results, and installing a positive mindset appears to be what they are looking at achieving.

Enoka revealed in early 2017 how his famous policy functioned within the New Zealand ranks, saying: "A d***head makes everything about them.

"We look for early warning signs and wean the big egos out pretty quickly. Our motto is, 'If you can't change the people, change the people'."

Pierre-Emerick Aubameyang still has a future at Chelsea despite Graham Potter's "tough" decision on the striker's omission from the Blues' Champions League squad.

Chelsea head coach Potter left Aubameyang out of his 25-man squad for Europe, bringing in new recruits Joao Felix, Enzo Fernandez and Mykhailo Mudryk.

The Gabon international last started for Chelsea in November and has scored just three goals in 18 appearances – in which only 10 of those have been starts – amid a frustrating spell at Stamford Bridge.

But Aubameyang netted both home and away against Milan in the Champions League, starting all six games, with Potter acknowledging the difficulties of naming his squad with Chelsea's depth of riches.

"I don't think it's going to be difficult because Pierre is a professional and of course, I understand he will be disappointed," Potter said.

"It was a tough decision, a tough call. We had three in and two had to go out. He was the one that missed out, he's done nothing wrong at all.

"We wanted to give David [Fofana] some game time today to see where he's at and give him that opportunity. I think you saw that one flash that he's got.

"Pierre is just unfortunate and he will be fighting for his place for the rest of the season. Whichever decision we made there was always going to be a conversation about it but it was my decision.

"It was a tough decision absolutely, sometimes you have to make these calls but it's absolutely nothing bad against him. He's done nothing wrong at all."

An image posted on Instagram by Aubameyang's brother Willy sparked controversy after it appeared the former Arsenal forward was in Italy as Chelsea were held to a goalless draw by Fulham on Friday.

Potter dispelled the speculation over an unexpected absence, though, explaining Aubameyang was free to do what he pleases with a rare chance to take time away.

He added: "He trained today, he trained very well and he's got the weekend off so we can report on Monday. It's a free world."

Graham Potter acknowledged time will be required for his new-look Chelsea to gel but he is "confident" the Blues will qualify for the Champions League.

Chelsea were held to a goalless draw at home to local rivals Fulham on Friday, as the Blues – who offered full debuts to Enzo Fernandez and Mykhailo Mudyrk – lacked fluency at Stamford Bridge.

Potter's side are a long away from top-four chasing form, sitting ninth in the Premier League, but the Chelsea head coach remains optimistic his team will be playing in the Champions League next season.

When asked about a top-four finish, Potter said: "I'm confident with the potential we have. I'm confident with the ability we have within the group.

"What we need to do now is gel the team. That's the challenge, that's what we have to do.

"There's still more football to play, but at the same time I don't want to worry about what we're going to do in four, five months' time. I need to focus on the next day, the training session and the next game."

Argentina World Cup winner Fernandez was signed for a Premier League record £106.8million (€121m) move from Benfica, but largely impressed on his debut just three days after the transfer.

"Very good, considering he's been in the country not very long," Potter said of Fernandez on Sky Sports.

"He doesn't know us, we don't know him so well but I think you can see flashes of his quality and personality. He'll get better and better."

Liverpool manager Jurgen Klopp questioned how Chelsea managed to spend so heavily in January, while Manchester City boss Pep Guardiola echoed a similar sentiment.

Mudryk, Benoit Badiashile, Andrey Santos, David Datro Fofana, Joao Felix and Noni Madueke all arrived alongside the record-breaking agreement for Fernandez.

Potter was keen to focus away from just the transfer fees spent by a Todd Boehly-led Blues consortium, as he outlined his next challenge in west London.

"I think you have to look at it all in terms of transfer fees and salaries," Potter said.

"You can sign someone for less of a transfer fee but the salaries are enormous, so it just depends on how you structure the contract, how you structure the deal.

"But we're confident in what we're doing and I think we've done a good job and now my job is to improve the team."

Graham Potter called for patience as he warned it will not be "straightforward" getting a new-look Chelsea side to gel after they were held to a goalless derby draw by Fulham on Friday.

Enzo Fernandez started at Stamford Bridge three days after making a Premier League record £106.8million (€121m) move from Benfica, while Mykhaylo Mudryk was replaced by fellow new boy Noni Madueke at half-time on a frustrating evening for the Blues.

Kai Havertz hit the post in the first half and David Datro Fofana – another of a raft of new Chelsea signings – had an effort cleared off the line by Tim Ream.

Fulham were good value for a point that keeps them above their ninth-placed neighbours in sixth spot.

Chelsea were disjointed, understandably lacking fluency following the arrival of so many new players, and head coach Potter says they will need time to build an understanding.

He told BBC Sport: "There was a lot of excitement and positivity from the start, a good atmosphere. The spirit of the players was really good. They worked hard for each other against an organised team.

"They've been together a while. We're a different stage of that – players coming back from injury and new players. We needed time to settle everything down. We were missing the connection, fluidity and confidence that comes from knowing each other.

"The decision we took in the window, you can see the profile in terms of age. We feel we have a very strong group of players. We have to gel and become a really good team. That's where the work is.

"It's working together. When players have been injured, they have not been on the training pitch. We have new players with us. It's about getting ideas across and working with the group.

"Sometimes you have to look at the whole package. Young players, nice mix of them both. For us, it's about improving.

"New players are adapting to a new country and a new league. It's not straightforward. When the price tag is what it is, questions will be asked, it's the nature of the business."

The return from injury of Reece James and Ben Chilwell was a big plus for Chelsea, while Potter revealed winger Mudryk was withdrawn after struggling with a cold this week.

Pierre-Emerick Aubameyang has been dropped from Chelsea's Champions League squad, with head coach Graham Potter bringing in new recruits Joao Felix, Enzo Fernandez and Mykhailo Mudryk.

The dramatic move to ditch striker Aubameyang reflects the striker's declining status with the Blues, for whom he last started a game in November.

Potter warned on Thursday there would be "awkward" conversations ahead as he finalised his group for the remainder of Chelsea's European campaign, and leaving out 33-year-old Aubameyang may have been on his mind at the time.

The former Arsenal and Barcelona frontman has scored only three goals this season in 18 appearances, of which 10 have been starts, and his absence leaves Chelsea without an out-and-out striker.

Aubameyang started in all six of Chelsea's Champions League group games, scoring home and away against Milan.

Potter has instead put his trust in Kai Havertz, who has spent much of his career as an attacking midfielder, plus attackers Joao Felix, who is on loan from Atletico Madrid, and Mudryk, who arrived from Shakhtar Donetsk.

Raheem Sterling, named as a midfielder on Chelsea's squad list, is another front-line option.

Chelsea face Borussia Dortmund at the last-16 stage of the Champions League, with the away leg on February 15 and the home game set for March 7.

Winning that competition looks to be club's best opportunity of getting back into the Champions League for next season, given Chelsea are flagging in 10th place in the Premier League.

Joao Felix and Mudryk have been joined by fellow January signing Fernandez in Potter's squad for Europe, but four players acquired during the mid-season transfer window miss out: Benoit Badiashile, Andrey Santos, David Datro Fofana and Noni Madueke.

Chelsea, like all clubs, were only allowed to add three new names to the squad that contested the group stage, with no more than 25 players allowed.

Another notable inclusion was Hakim Ziyech, the winger who looked set to join Paris Saint-Germain on deadline day, only for the deal to collapse late on.

Jurgen Klopp is confused over how Chelsea's transfer business is possible after the Blues brought in eight January signings.

Chelsea signed World Cup winner Enzo Fernandez from Benfica for a British record transfer fee of £106.8million (€121m) on Tuesday, pushing their January spending past £300m.

That capped a hectic window for Chelsea, who splashed out to sign Mykhaylo Mudryk, Benoit Badiashile, Andrey Santos, Noni Madueke, David Datro Fofana and Malo Gusto, who will spend the rest of the season on loan at Lyon.

Joao Felix also signed on loan from Atletico Madrid as, with Chelsea sat 10th in the Premier League, co-owner Todd Boehly gave head coach Potter an array of options with which to mount a push for the top four.

In contrast, Klopp's Liverpool, above Chelsea on goal difference in ninth, only brought in one signing, bringing in Cody Gakpo from PSV in January for a reported initial fee of around £37million (€42m).

Klopp is baffled over how Chelsea's spending is allowed in relation to Financial Fair Play regulations, telling reporters: "I don't understand this part of the business about what you can and can't do. It's a big number.

"I don't understand how it's possible with all the things around, but obviously it's not up to me to explain how it works."

When asked for his personal views on Chelsea's record-breaking January dealings, the Liverpool manager joked: "I say nothing without my lawyer."

Despite the eye-watering fees Chelsea have paid out, Klopp feels it could be money well spent with the quality of players they have signed.

"They're all really good players," Klopp said. "From that point of view, congratulations.

"The players they brought in, I didn't think once 'why did they do that?' They will play well together."

This term, Liverpool have failed to hit the high standards they have set since Klopp's arrival at the club in 2015, during which they have won both the Champions League and Premier League.

Liverpool have been hit by injuries to Virgil van Dijk, Luis Diaz and Diogo Jota, while some players have struggled for form.

One such example is midfielder Fabinho, who has been benched in recent games for 18-year-old Stefan Bajcetic and was fortunate not get sent off for a rash tackle in Liverpool's FA Cup defeat to Brighton and Hove Albion last week.

"He knows he's not flying and that he needs to work back," Klopp said of Fabinho. "That's how it is. 

"It's really helpful we have Stefan. You need a guy who wins challenges but plays football as well. Fab did that for us for plenty of years, absolutely brilliant. Best in the position for a long time and at the moment it's not clicking, that's true as well.

"He's not the happiest person on the planet, but he understands the decision."