Chelsea manager Carlo Ancelotti admitted his side had beaten FC Porto in their Champions League opener without playing particularly well.
The Blues were 1-0 winners over the Portuguese side at Stamford Bridge after Nicolas Anelka scored the only goal of the game on Tuesday night.
"We can't always play our best and we have won without playing well," said Ancelotti.
"This is an important thing for the team to win with our character.
"Porto played very well and at the end we were a little bit tired because we had a strong match last Saturday.
"It was important to win and maintain confidence in the dressing room."
Chelsea were without the suspended Didier Drogba for the first time with the striker beginning a three-match Champions League ban for his angry reaction to last season's exit at the hands of Barcelona.
But in his absence, Ancelotti was pleased with the performance of Anelka.
He added: "Anelka is a great player. With Drogba or without Drogba, he can play alone in the centre of the attack and together with Drogba.
"I am very happy for him because he is doing very well now.
"Our attacking play was good in the first half and we had a problem in the second half to maintain that.
"I don't think that Drogba was missed tonight."