Chelsea boss Jose Mourinho played down their flat performance for the 0-0 draw with Sunderland.
His side failed to score in a game for the first time this term.
Mourinho said: "The Sunderland guys, they were watching our game at their houses against Schalke and they went to bed at 11pm after the game.
"We played 90 minutes at Schalke and we arrived home at 5am. I don't forget this, I praise my guys. They are doing fantastically well.
"I know how some Einsteins in football, they like to say that defending is a crime. Defending well is not a crime, to defend well you need to train, you need to work, you need to understand things well, so for sure they did it during the week.."
