Cristian Stellini has questioned the mentality of Tottenham's players and accepts "something has to change" after a 4-1 loss at Leicester City.
Spurs failed to build on last weekend's 1-0 win over Manchester City as their hopes of finishing in the Premier League top four suffered another setback.
Rodrigo Bentancur gave Tottenham the lead, but Leicester responded with goals from Nampalys Mendy, James Maddison and Kelechi Iheanacho before half-time.
Harvey Barnes added a late fourth at the King Power Stadium to inflict a fourth league defeat on Spurs in seven matches since the turn of the year.
Tottenham assistant Stellini, who took press duties despite Antonio Conte returning to the dugout following gallbladder surgery, was not pleased with what he saw on Saturday.
"To be consistent is a long process; it's a mental process," he said. "You have to be better mentally and better with the approach. After we scored the goal, something changed.
"We struggled a lot and we are disappointed for that. There's not an explanation because if you know what happened you can change this.
"It happened last season, after we beat Manchester City we lost to Burnley. We are a team, and in the team something has to change, not individually. It's about the desire.
"It's about recovering the mental energy. After a game against City, maybe we used all the energy we had. To recover that is like a battle. You have to recreate the same energy."
Conte returned to Tottenham's training ground on Thursday, eight days on from undergoing surgery, but Stellini explained the head coach is still recovering.
"It's good for the club, the team and everyone to have Antonio back," he said. "He has to take it easy a bit.
"He cannot use his energy 100 per cent and we have to give something more to cover the gap. We know we have to be more responsible."
Tottenham are two points behind fourth-place Newcastle United, who played out a 1-1 draw with Bournemouth later on Saturday and have a game in hand.
Conte's side host London rivals West Ham and Chelsea in their next two league games, but first is a Champions League last-16 first-leg tie away at Milan on Tuesday.
Huddersfield all but relegated from Championship while League Two play-off spots decided
Huddersfield Town saw their relegation from the Championship all but confirmed after a 1-1 draw with fellow strugglers Birmingham City on Saturday.
The Terriers avoided a defeat that would have seen them relegated on Saturday, but even a win on the final day over promotion hopefuls Ipswich Town will not be enough unless they overcome a huge goal difference of 15 goals with Plymouth Argyle.
Birmingham remain in the other relegation place and now must beat Norwich City to stand a chance of staying up with Sheffield Wednesday, Plymouth and Blackburn Rovers also still in danger.
At the other end of the table, the Canaries dropped points in a 2-2 draw with Swansea City, leaving the door open for Hull City, who face Ipswich Town later today.
Bayern star Kane scores 400th senior goal
Harry Kane surpassed the 400-goal mark for his senior career as his double helped Bayern Munich beat Eintracht Frankfurt 2-1 at the Allianz Arena on Saturday.
Kane moved within one of the milestone as he put Bayern 1-0 up after just nine minutes, coolly finishing from close range after Konrad Laimer's pass had set him up.
Then, after Frankfurt levelled through Hugo Ekitike, Kane slotted home a penalty with typical aplomb following a foul on Thomas Muller to move himself onto 400 career goals and ultimately lead Bayern to victory.
Kane scored 280 of his goals in 435 appearances for Tottenham, overtaking Jimmy Greaves to become the club's all-time leading scorer when he netted for the 267th time in Spurs colours against Manchester City last February.
His tally of 213 Premier League goals, meanwhile, puts him just 47 behind the competition's all-time leader Alan Shearer, who scored 260 times for Blackburn Rovers and Newcastle United.
Kane is also the most prolific player in England's history, his 62 goals for the Three Lions coming in 89 international appearances.
He memorably missed the chance to surpass Wayne Rooney's previous record of 53 when he blazed a penalty over the crossbar in the Three Lions' quarter-final defeat to France at the 2022 World Cup, only to clinch his place in history in a Euro 2024 qualifier against Italy three months later.
The very first goal of Kane's senior career came in League One during a loan spell with Leyton Orient as they thrashed Sheffield Wednesday 4-0 in January 2011.
That was the first of five goals Kane scored in O's colours, while he also netted nine times in a loan spell with Millwall in 2011-12 and twice during a stint with Leicester City the following season.
Arteta wants to prove supercomputer wrong as Arsenal prepare for derby test
Mikel Arteta is looking to prove the Opta supercomputer wrong as Arsenal prepare for perhaps the biggest test of their Premier League title credentials, in Sunday's North London derby at Tottenham.
Arsenal began the weekend one point clear of Manchester City at the top of the table, though Pep Guardiola's men have a game in hand and have been in ominous form lately, winning their last four league matches.
Five wins for City will ensure they retain their crown, and according to the Opta supercomputer, the champions started the weekend with a 71.7% chance of topping the pile, compared to 26.6% for Arsenal and just 1.7% for Liverpool.
Arteta hopes to see Arsenal's figure boosted by a derby win, saying: "I don't know what to say, hopefully we can trick that computer and make it a bit higher!
"Maybe it needs to update the software, we need to help it or give it more tools. Hopefully we can change that!
"We are there. We have to look at ourselves and try to perform in the best possible way to win our matches and I can't wait to see what happens.
"We had a big win in the last London derby against Chelsea and now we have another big one. I'm sure if we're going to win the league, we're going to have to beat Spurs as well."
Tottenham, meanwhile, need points if they are to overhaul Aston Villa in the battle for Champions League qualification, with fifth place now extremely unlikely to be enough.
Ange Postecoglou, though, is more interested in seeing how Spurs measure up to a side they hope to challenge in the future.
"We understand the importance of the game but ultimately, it's still about us measuring ourselves against the teams we want to be challenging on a more consistent basis," Postecoglou said.
"It's a great opportunity to do that on Sunday."
PLAYERS TO WATCH
Tottenham – Son Heung-min
Son scored twice for Spurs in the reverse fixture against Arsenal in September – a 2-2 draw at the Emirates Stadium. In all competitions, only five players have scored more goals in the fixture's history than Son's seven.
The only player to score multiple goals in both north London derby matches in a league season was Arsenal's Ted Drake, who did so back in 1934-35.
Arsenal – Martin Odegaard
Odegaard has been involved in six goals in his last six away appearances in the Premier League, scoring three and assisting three.
The Gunners captain was in mesmerising form in Tuesday's 5-0 win over Chelsea, leading all players on the pitch for assists (two), chances created (eight), passes into the final third (34) and duels won (eight). A repeat performance would be huge for the visitors' title hopes.
MATCH PREDICTION – ARSENAL WIN
Tottenham have won just one of their last six Premier League games against Arsenal (one draw, four defeats), with their four losses in this span as many as they had suffered in their previous 16 against the Gunners (six wins, six draws).
They also lost this exact fixture 2-0 last season, meaning the Gunners could win on back-to-back league trips to Tottenham for the first time since enjoying a run of three victories there between 1987 and 1988.
Arteta's men know there is no margin for error with the title race in City's hands.
Even a draw could prove fatal to their hopes – at the end of the 2015-16 season, the North London derby was the most drawn fixture in Premier League history, with 20 of 48 meetings finishing level (42 per cent). Since then, only four matches between these rivals have seen the points shared (27 per cent).
Arsenal have kept six straight clean sheets on their travels in the Premier League, with only two teams ever keeping seven in a row – Chelsea from September to December 2008 and Manchester United from November to February in 2008-09. The Gunners should have enough to grind out a huge win.
OPTA WIN PROBABILITY
Tottenham – 31%
Arsenal – 41.3%
Draw – 27.7%
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