Chelsea boss Jose Mourinho says is no truth to recent reports that striker Diego Costa wants to leave Chelsea and return to Atletico Madrid. Speaking after Chelsea's 1-0 friendly win over Sydney FC on Tuesday, the Portuguese tactician said: "He's the guy responsible for everything good we have in the dressing room.

"He's so happy, so funny, he enjoys every minute and is the happiest guy in the dressing room.

"If this is unhappiness I'm happy with that. He was not happy with the news."