Sarri disappointed with his Blues' performance against Tottenham.
Maurizio Sarri wasn't happy with how his Chelsea side fell to a 3-1 defeat to Tottenham on Saturday.
The north London club broke the deadlock in the eighth minute through Dele Alli, and Harry Kane doubled the lead eight minutes later before Son Heung-min's brilliant solo goal made it 3-0 in the 54th minute.
Olivier Giroud came of the bench to score a consolation goal for the away side late on in the game and after the clash Sarri said he knew his team 'had some problems' ahead of the London derby.
Speaking to BT Sport after the clash at the Wembley stadium, the Italian said: "I knew very well that we had some problems. Today we have seen that we have problems. We have to work, we have to improve.
"We were against a very strong team, especially when they can use very short counter-attacks. At the beginning of the match we lost a lot of balls in our half and it was a very big problem.
"It was clear. I think in the last two or three matches that we had a problem at the beginning of the match. Today the difference is only the opponent.
"We had a lot of problems. Physically we didn't do a very good performance, technically the same. We were not compact for 90 minutes.
"I think that we had a lot of problems and we have to work on a lot of the actions."