Diego Costa has been injured in Chelsea training.

Chelsea's first choice striker has suffered from a minor back problem for the past few days and has not been able to train fully with the squad for the whole of the sessions.

Blues boss Antonio Conte said: “It's important to see the players doing the training session. If I don't see a player doing the training session I can't put them in the game. These are my rules and it's important to understand this.

“My concept is very clear. I want to see my players doing the work in the training session.

"If someone is injured or there is some problem and I don't see the player in the training session it is impossible to think of putting him in the starting 11 or on the bench.

“In the last few days he had a pain in the back and for this reason he didn't train and didn't play.

“When Costa trained with us I saw always the right attitude but in these days he didn't train with us."