Bayern Munich shocked the Bundesliga by making a dramatic change in the dugout, replacing Julian Nagelsmann with Thomas Tuchel.
The decision came with Borussia Dortmund posing a serious threat to Bayern's hopes of an 11th consecutive league title.
Tuchel arrives with Bayern sitting one point off the Bundesliga summit and through to the Champions League quarter-finals, with the former BVB and Chelsea boss facing several pressing tasks.
Fending off his former club's challenge for domestic glory and plotting a route past Pep Guardiola's Manchester City will be among the immediate concerns, but there are others requiring Tuchel's attention.
From the futures of club stalwarts Manuel Neuer and Thomas Muller, to the need to suitably replace Robert Lewandowski, there will be plenty to keep Tuchel occupied until the end of the season and beyond.
Here, Stats Perform looks at five of the most pressing tasks facing Tuchel on his return to Germany.
Fix Bayern's sloppy backline
While Bayern boast the Bundesliga's best defensive record with 27 goals conceded this term, Tuchel – who was successful in making Chelsea tough to beat in his last managerial assignment – will be keen to examine a series of shortcomings at the back.
Having beaten Augsburg 5-3 in Nagelsmann's penultimate game at the helm, Bayern suffered a damaging 2-1 defeat at Bayer Leverkusen last time out, with Benjamin Pavard and Dayot Upamecano clumsily conceding a pair of second-half penalties.
With Nagelsmann known for employing a high defensive line and adopting an aggressive approach, Bayern have often appeared too open this campaign.
Of the Bundesliga-high 13 errors leading to shots made by Bayern players this season, three have resulted in goals, while last year's big-money recruit Matthijs de Ligt is yet to establish himself as a dominant defensive presence.
Tuchel's Chelsea kept five clean sheets in seven Champions League knockout games en route to being crowned European champions in 2021 – he will be confident of having a similar impact in his new job, given the defensive talent at his disposal.
Make crucial Neuer decision
The most controversial incident in Bayern's season before the change of coach came in January, when captain Neuer hit out at the club's decision to fire close friend and goalkeeping coach Toni Tapalovic.
Those comments were met with a furious reaction from the club's hierarchy, throwing Neuer's future in Munich into doubt.
A series of injuries – the latest a broken leg sustained during a skiing holiday – have limited Neuer to 16 appearances across all competitions this term, and with Yann Sommer's arrival giving Bayern two top-class goalkeepers to choose from, Tuchel has a decision to make.
While Neuer boasts a better save percentage (75.44 per cent) than Sommer (64.1) for Bayern this term, the 2014 World Cup winner will be 37 by the time he returns to fitness, and there may not be room for both shot-stoppers in Bayern's long-term plans.
Find Lewandowski's successor
No discussion of Bayern's inconsistent season would be complete without a mention of their failure to find an adequate replacement for goal machine Lewandowski.
Lewandowski left for Barcelona last year, having led the Bundesliga's scoring charts in six of his eight seasons with Bayern (2015–16, 2017–18, 2018–19, 2019–20, 2020–21 and 2021–22).
The Poland international hit 35 goals in as many league appearances in his final season with the Bavarian giants. This term, Jamal Musiala is their top Bundesliga marksman with 11 goals, one ahead of Eric Maxim Choupo-Moting.
While having five separate players on double figures across all competitions this term is no bad thing (Choupo-Moting, Musiala, Leroy Sane, Serge Gnabry and Sadio Mane), an established successor to Lewandowski is surely required.
Solve the Mane conundrum
On a related note, getting the best of last year's marquee arrival Mane will also be high on Tuchel's to-do list, with the Senegal attacker yet to hit the heights he reached at Liverpool.
Injuries and mixed form have meant Mane has started just 14 of Bayern's 25 league games, failing to net in any competition since a 6-2 win over Mainz in October.
Tuchel's previous success with a fluid forward line could bode well for Mane. In his only full Premier League campaign with Chelsea, the Blues were only outscored by Manchester City and Liverpool, with a plethora of players chipping in as the returning Romelu Lukaku fell out of favour.
Examine Muller's role
While the acquisition of a centre-forward will surely be at the forefront of Bayern's plans at the end of the season, the Bavarians' chances of short-term success could hinge on finding a regular role for Muller.
Muller, who became Bayern's all-time leading outfield appearance maker in the Bundesliga last month, has started just 14 league games this campaign, but his tally of 11 goal contributions (four goals, seven assists) in just 1,062 minutes demonstrates his lasting quality.
With Nagelsmann alternating between 4-2-3-1 and 3-5-2 shapes in recent weeks, Muller has featured in a number 10 role – where he previously thrived under Hansi Flick – and in a front two.
With high-stakes clashes against Dortmund and City on the horizon, Tuchel's first month at the helm could prove decisive, and finding a place for the experienced Muller could help the new boss make a flying start.
Dewsbury-Hall: Maresca will surprise people at Chelsea
Kiernan Dewsbury-Hall believes new Chelsea manager Enzo Maresca will "surprise a lot of people" when they watch the Blues this season.
The Italian led Leicester City straight back to the Premier League as Championship winners in his only season in charge and succeeds Mauricio Pochettino at Stamford Bridge.
The Foxes topped the second division table with 98 points, with Dewsbury-Hall a key figure in his squad as he netted 12 goals and provided 14 assists last season – his best tally in a single campaign.
Dewsbury-Hall was also named Leicester's Player and Players' Player of the Year.
The midfielder made the switch to West London earlier this month for £30million and is confident that Maresca will have Chelsea challenging for trophies in no time.
"The manager was a big catalyst in wanting me to come," Dewsbury-Hall told BBC Sport.
"I knew from Leicester, a club that went down and had a lot of problems, how he managed to galvanise that if everyone manages to buy into the system.
"I genuinely think in a short space of time we can be pushing for minimum top four - but more than that.
"He may be unknown for a lot of people, but he is top, top level. He will surprise a lot of people."
Chelsea's pre-season got off to a frustrating start as they were held to a 2-2 draw by League One side Wrexham in Maresca's first game in charge on Wednesday.
Dewsbury-Hall did not play in that match but is training with the squad in the United States and could feature in their next outing against Celtic on Saturday.
The 25-year-old is confident the manager's tactics will come across soon, with the players buying into his style.
"We've only been doing it for two or three weeks, but the combination plays are really quick and tidy," he added.
"That's after two weeks. I remember he said to us at Leicester after six months or a year, there might be teething problems at the start, but it will improve.
"Within the first week at Leicester, I was convinced this was top, top level. I felt a bit stupid; I thought I knew a lot about football, but he was teaching me things on a daily basis that I didn't really know before. He has an aura, he can be strict, or gentle and soft - he has both sides.
"I am getting the same feedback here with the lads. They've bought into it here from minute one which is exciting. With a system and philosophy, you need everyone to buy in because, if they do, you can really achieve something."
Ederson slams reports of rift with Man City backup Ortega
Ederson has hit out at reports of a rift between himself and fellow Manchester City goalkeeper Stefan Ortega.
The Brazilian was substituted after suffering a fractured eye socket in City's penultimate game of the Premier League season, a vital 1-0 win over Tottenham.
Ortega replaced him and made a brilliant save to deny Son Heung-min as City maintained their slender lead over Arsenal at the top of the table, sealing an unprecedented fourth straight title by beating West Ham five days later.
Ortega was widely lauded for his role in that triumph, and an article published by The Athletic this week suggested Ederson took issue with that praise.
However, the goalkeeper – who missed the Copa America as a result of his injury – has now moved to shut down those suggestions with a post to his Instagram story.
"I would like to clarify that the note published by The Athletic yesterday, referring to my alleged dissatisfaction with a co-worker, is completely false," he wrote.
"The alleged day reported was, without a doubt, one of the most difficult days of my career, when I suffered a fracture that prevented me from playing in the final stretch of the season and, consequently, from representing my country in the Copa America.
"At the time of the injury, my only thought was to continue in the match, defending City in the fight for the title.
"But the emotion of the match would be greater than the reality and, inevitably, I would not be able to continue as I would have liked due to the damage it caused, completely blocking my field of vision. I remain focused on preparing for the season."
Ederson has been linked with a transfer in recent days, reportedly attracting interest from Saudi Pro League clubs.
Slot's Liverpool success will be measured by trophies, says McAllister
Gary McAllister says Arne Slot must be prepared to aim high by targeting trophies if he is to be successful with Liverpool.
The Dutchman is set to begin his first season in charge of the Reds after being appointed as Jurgen Klopp's successor in May.
Liverpool enjoyed a trophy-laden spell under the German, winning their first-ever Premier League title, as well as a Champions League, a Club World Cup, a Super Cup, an FA Cup and two EFL Cups.
However, Slot was no stranger to success while at Feyenoord, leading the team to the Eredivisie title in 2022-23 before lifting the KNVB Cup in April during his final season with the club.
McAllister, who won five trophies in the two years he spent at Liverpool, says Slot's success will be determined by the silverware he collects.
"Liverpool is a club that's synonymous with winning, and when you don't win you fail," McAllister told Stats Perform.
"When there's a new management team, you're given a little bit more time, but the facts are Liverpool's target, I felt, and as a player that played against them for most of his career, the targets that Liverpool set, you go into every tournament looking to win it.
"You try to win every game and that's the expectation of the club and that's what makes it a very special club."
Klopp spent nine years at Liverpool, breaking club records as his team pushed for trophies on a regular basis.
The Reds enjoyed a club-record 68-match unbeaten run at Anfield over nearly four years in the Premier League between April 2017 and January 2021.
Klopp also oversaw three of the four most prolific seasons in Liverpool's history, including the club-record total of 147 goals scored in 2021-22.
Slot has admitted he has "big shoes to fill", but McAllister believes the 45-year-old will be able to live up to the high expectations left behind by Klopp.
"Arne arriving at the club, following Klopp, realising that it's such a difficult job anyway, but to follow somebody who's done particularly well at the club over an eight, nine-year period is going to be tough, and I don't think the new manager is under any illusions," he added.
"What I would say is he's a man that seems to be a very strong character, good personality, and he's just got to come in and be his own man and trust what he does.
"He's done very well in his previous managerial career and coming to Liverpool I feel is a natural progression in the levels of the game that he's worked at.
"So, everybody at the club will be deeply backing him and be right behind him, he'll have amazing support."
Liverpool's first pre-season game under Slot ended in a 1-0 defeat to Preston North End last week before the players flew out to the United States for a three-game tour.
They are also only one of two Premier League clubs yet to conduct any business in the transfer window so far, but McAllister urged fans to be patient with Slot while he gets settled in his new role.
"Whenever there's a change at a club, I think the fans have got to realise that it does take time for a new manager, a new coaching group to come in and get their ideas over to the players," he said.
"There's got to be a modicum of patience, but at Liverpool, expectation levels are very, very high and sometimes, in professional soccer, in elite soccer, patience is something that most managers don't get.
"As much as the fans have got to be aware that everything is new and there are new ideas, Arne and the players will want to get off to a quick start.
"I feel that this pre-season tour is going to help them start the season against Ipswich Town very strongly. I feel the games that they've got here in the US, here in Pittsburgh against Betis, and then we go to play Arsenal and Manchester United, the build-up is pretty good."
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