Rafael Benitez claimed it took him just one training session to see where Chelsea could improve.
The Spaniard said: "We didn't talk about the Champions League or the next game but about little things I saw and we could improve a bit, and things they were doing well, which Roberto Di Matteo was doing."
He added: "It's a good squad, a good team.
"If I'm here, it's because I think we can win with them.
"If we can improve by training hard, we will."
Benitez revealed he would look to Chelsea's big-name players to help him get their season back on track.
"In a top side, normally, there will be some important players, some who have more influence," he said.
The former Liverpool boss appeared to accept he would not enjoy the same control as he did during his six years with the Reds.
"Here, you have a technical director and the manager is a head coach who has to improve the players he has," he said.
"I will talk to the people involved if it's necessary to improve the (squad)."