Guus Hiddink read his Chelsea players the riot act after their 1-0 victory over Champions League opponents Juventus last night.
The Daily Mail says Hiddink was furious that his Chelsea side were unable to break Juve's resistance after Didier Drogba had put them ahead.
The Dutch coach, who has now won his two games in charge of Chelsea 1-0 following the win at Aston Villa, said: "I am satisfied that we won but overall I am not satisfied with the performance.
"We started well but after the goal we dropped off too far and we were too anxious. Juventus dominated the second half but did not create any danger.
"The tie is evenly balanced but I'm pleased we kept a clean sheet. I was not happy with the functionality of the team but we will improve it."
Hiddink also confirmed that the players he has inherited from Luiz Felipe Scolari are not fit enough to play top-level football and admitted his team tired in the second half against former Chelsea boss Ranieri's ageing Italian team.
Hiddink added: "They are not at tip-top physical level. They are at a high level of fitness but not near the top for games like this. It is something we will work on."