Thomas Tuchel said Chelsea "stopped defending" as Brentford ran riot in a sensational 4-1 derby victory at Stamford Bridge.
Brentford stunned the European champions on Saturday, emphatically securing a first win over their west London rivals since 1939.
Antonio Rudiger's long-range thunderbolt put the Blues in front early in the second half, but Thomas Frank's side hit back with three goals in the space of 10 minutes.
Vitaly Janelt struck twice either side of Christian Eriksen's first goal for Brentford and Yoane Wissa added a fourth in the closing stages just after coming on.
Chelsea had won five consecutive games since Roman Abramovich put the club up for sale, but they were picked off time and again as rampant Brentford moved 11 points clear of the Premier League relegation zone.
Blues head coach Tuchel felt his side's performance was out of character ahead of a Champions League quarter-final first leg against Real Madrid on Wednesday.
He told BBC Sport: "Nobody saw it coming, especially after going 1-0 ahead. It was very untypical of us. But we stopped defending. We were not aware of enough of the danger, were sloppy with the defending and got punished.
"They made the most of it in those 10 minutes. Right after their third goal we had 10 minutes where we had big, big chances and we missed them.
"They were lucky and clinical enough to get three goals. We did not defend like it is needed to in the Premier League and got punished."
Tuchel had expected third-placed Chelsea to be vulnerable in their first game back after the international break.
He explained: "The start was not a surprise because we came from all over the world from national duty so I expected it to take time. The first 25 minutes we looked a bit leggy and needed to find rhythm.
"The opponent defended deep with 10 men behind the ball, so you need a shot or action to open the game, which we did. Then we gave the game away very cheaply."
Chelsea will now regroup before doing battle with LaLiga leaders Madrid at Stamford Bridge in midweek.
"It is not about Real Madrid. It is about us. It is one day off now and on Monday we start again," he said.
Ronaldo delivers another hat-trick as Al Nassr ease past Al Wedha
Cristiano Ronaldo crafted a decisive hat-trick as Al Nassr hammered Al Wedha 6-0 in Saturday's Saudi Pro League meeting.
Portugal veteran Ronaldo found the net twice in the first 12 minutes at Al Awal Park before completing his treble after the interval.
Sadio Mane teed up Ronaldo's third finish, as well as an 18th-minute strike from Otavio, who returned the favour for the Senegal international to score on the stroke of half-time.
Mohammed Al Fatil added a late sixth as Al Nassr recorded their seventh straight league win since their March 7 loss against Al Raed, moving them back within nine points of leaders Al Hilal.
Jorge Jesus's Al Hilal swept Al Tauwoon aside in a 3-0 away triumph on Friday for their fourth straight victory across all competitions.
Talisman Aleksandar Mitrovic opened the scoring at King Abdullah Sport City Stadium before Saud Abdulhamid and Saleh Alsherhi wrapped up a win that kept Al Hilal in charge of the title race.
There was no such fortune for fifth-placed Al Ittihad as they fell to a third straight defeat in all competitions after a 3-1 loss away against Abha.
Jota levelled after Grzegorz Krychowiak's 57th-minute penalty, only for Hassan Al-Ali and Fabian Noguera to power hosts Abha to a comfortable win.
Bayern Munich defender Guerreiro doubtful for Real Madrid match - Tuchel
Bayern Munich defender Raphael Guerreiro is doubtful for next week's Champions League semi-final return leg at Real Madrid after he picked up an injury in their 3-1 loss to Stuttgart on Saturday, head coach Thomas Tuchel has said.
Bayern, who also had Eric Dier taken off at half-time with a head injury, face Real in Spain on Wednesday after their 2-2 draw in Munich earlier this week.
Portugal international Guerreiro was taken off in the 17th minute after he hurt his ankle in an attempt to block a shot.
"Raphael Guerreiro needed crutches to walk. It is very, very bitter for us. He was supposed to get some playing time today to be ready for Wednesday. Instead, now we have to see what happens," Tuchel told reporters.
"Eric Dier had to get stitches to the head wound that then opened up again so we at some point said it was enough. We did not want to risk it."
Bayern have several injury concerns, with defender Matthijs De Ligt still doing individual training and fellow defender Dayot Upamecano, who came on for Dier, working back to full fitness after recovering from injury.
"If there ever was a day when we needed to put this behind us quickly then it is today, and we see what we need for Wednesday," Tuchel said.
"The medical meetings at the moment are more maths than medical. Who is on 60 per cent, who on 30 per cent, who can't play at all," said the coach, who will leave at the end of the season following a disappointing domestic run.
Bayern are second in the league, two points ahead of Stuttgart in third and with two games left to play. The title has already been wrapped up by leaders Bayer Leverkusen.
Brentford 0-0 Fulham: Bees hold on after Jimenez’s late miss
Raul Jimenez missed a glorious late chance as Fulham and Brentford shared a goalless draw in a profligate Premier League clash at the Gtech Community Stadium.
Both sides saw their Premier League winless runs extend on Saturday, with Brentford without victory in two games and Fulham not triumphing in their last three.
It could have been a different story, though, if not for substitute Jimenez lifting a gilt-edged 73rd-minute opportunity over as Marco Silva's Cottagers failed to snatch that late chance.
This draw leaves Brentford – who saw Bryan Mbeumo denied by the crossbar in the first half – in 16th but with their Premier League status already secure, while Fulham are 12th.
A powerful effort from Alex Iwobi had Mark Flekken worried as his strike whistled over the crossbar from the edge of the box in the eighth minute.
A fast break from Brentford saw Ivan Toney slot a throughball in behind the Fulham defence to Mbeumo, whose deflected right-footed strike from cannoned off the woodwork before Keane Lewis-Potter fired straight at Bernd Leno.
Lewis-Potter again came close to finding the opening goal after 44 minutes as he burst into the box before lifting the ball over Leno, but Issa Diop recovered superbly to head it off the line.
Rodrigo Muniz might have felt he should have broken the deadlock early in the second half, though his header from Iwobi's cross fell into the arms of Flekken.
Timothy Castagne popped up in the penalty area at a corner in the 60th minute but the full-back could not convert at the near post as his header flew into the stands behind the goal.
Jimenez had a gilt-edged opportunity to snatch the winner as Adama Traore shrugged off his marker before picking out the Mexico striker, who somehow missed with the goal at his mercy.
Traore tested Flekken late on as the Fulham winger struck a vicious effort low towards goal but the Brentford goalkeeper got down well to ensure a point for his side.
Brentford struggle as Toney’s goal drought continues
Having netted four goals in his first five Premier League games after returning from suspension, Toney has not scored in any of his last 10.
He’s now matched his longest run without a league goal since a run of 10 with Peterborough United between February and April 2019, while Brentford have suffered from his struggles.
Brentford won 2-0 against Sheffield United in their previous Premier League home game but only once this season have they won back-to-back league games at the Gtech Community Stadium.
The Bees' consecutive wins over Burnley and West Ham in October/November remain the only time they have achieved the feat as Thomas Frank's side fail to live up to last season's performances at home.
Poor finishing prevents three points for the Cottagers
Fulham have now stopped the opposition from scoring a first-half goal in 22 of their 36 games, only Everton (23) and Arsenal (25) have done this more often in the Premier League this season.
The Cottagers have also struggled in front of goal in the opening 45 minutes of games, failing to find the back of the net in the first half in 23 of their 36 top-flight outings this term.
The draw means Silva’s side remain 12th, albeit sitting just four points off the top half of the table with two games remaining.
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