Chelsea slumped to an incredible 4-0 defeat to Bournemouth with a brace from Josh King, with David Brooks and Charlie Daniels scoring one apiece.
In a game Chelsea were tipped to win, the Blues dominated the first-half but crashed in the second-half as Eddie Howe’s side ran riot.
This defeat marked the heaviest league defeat Chelsea have suffered since a 5-1 loss to Liverpool in September 1996.
With the game still on, Chelsea fans made their voices heard as they chanted ‘you don’t know what you’re doing’ towards the beleaguered manager in the dugout.
The pressure is beginning to pile on Sarri as the Blues have dropped out of a Champions League place.
After the game, Sarri locked himself in the dressing room with the players for almost 50 minutes, asking the rest of his coaching staff to leave.
Explaining his decision, 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 to play.
“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.”
On why he asked his coaching staff to leave, he added: “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.”