Sarri replaced Antonio Conte as Chelsea manager last summer
Manager Maurizio Sarri said it seems his Chelsea players are "very difficult to motivate" as he heavily criticised their performance in defeat by Arsenal.
The Blues lost 2-0 at the Emirates Stadium and only had one shot on target in the match.
Chelsea have only won two of their last five matches and are now just three points clear of fifth-placed Arsenal and sixth-placed Manchester United.
"I'm really angry about the approach that we adopted today," Sarri said.
"It's an approach we can't really accept."
In a remarkable press conference after the defeat, Sarri said he wanted to speak in his native Italian rather than English "because I want to send a message to my players and I want my message to be very clear".
"I have to say I'm extremely angry, very angry indeed," said Sarri, who took over as Chelsea manager at the start of the season. "This defeat was due to our mentality, more than anything else.
"This is something I can't accept.
"This group of players are extremely difficult to motivate.
"You can find yourself in difficulties from time to time, but we need to react to those difficulties a lot better than we did today.
"This is not a team that is going to be well known for its battling qualities but we need to become a team that is capable of adapting, possibly suffering for 10 or 15 minutes then playing our own football.
"Today we didn't play our own football."
More to follow.
Source: bbc.com