Chelsea boss Jose Mourinho fears his players have lost their title hunger.
After defeat to Crystal Palace, Mourinho indicated a handful of Chelsea's squad are resting on their laurels.
Asked how he can stave off a lack of appetite, he said: "If that is the case, it is very sad.
"When I win, I want to win again. If you win it once and the next you are not on fire, that is sad. My medal is at home. In a drawer."