Maurizio Sarri locked his Chelsea players in the dressing room for over an hour following their thrashing by Bournemouth.
The Cherries cruised to a 4-0 win over the hapless visitors as Josh King bagged a brace while David Brooks and Charlie Daniels notched.
Chelsea started Gonzalo Higuain for the first time in the Premier League but he was hooked after 65 minutes.
And Sarri laid into his flops after full-time as they were overtaken by Arsenal in the race for the top four.
He eventually left the dressing room for his post-match press conference 90 minutes after full-time.
Sarri said: “It is very difficult to have an idea about the performance.
“I think we played well in the first half, we conceded the goal and we stopped playing.
“We didn’t play as a team, but 11 players. We were in trouble, it was difficult to say why. After the first half there was the possibility to solve the problem. Not with that kind of reaction, so it is difficult to understand why.
“I wanted to try to understand after the match, I spoke to the players but it is difficult for them to say why. I have to try again tomorrow because I need to see why.
“In that moment I wanted to talk to them alone, without anybody. I needed to understand, it was so different in the first and second half. I want to try again tomorrow. ”
When asked if his players are good enough, he added: “I think so, maybe we are not at the top of the table. But we cannot lose 4-0 to Bournemouth, I want to respect them. Maybe it is my fault that i am not able to motivate them.”
For all their possession the closest Chelsea came to scoring in the opening period was Mateo Kovacic’s header which was touched onto the bar by Bournemouth keeper Artur Boruc.
Bournemouth were a threat on the break with Brooks and Junior Stanislas were both denied by Spanish keeper Kepa Arrizabalaga.
Chelsea fell behind two minutes after the break when Brooks’s astute reverse pass released King to fire high past Arrizabalaga and things went from bad to worse as King’s pass over the top left released Brooks who stepped inside David Luiz’s half-hearted tackle and fired home.
Stanislas set up King for his second after a flowing move and Daniels rubbed salt in Chelsea’s wounds, his stoppage-time goal meaning they drop below Arsenal into fifth on goals scored.
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