Chelsea boss Jose Mourinho will play Diego Costa against Aston Villa today.

Mourinho has said for weeks that Costa, who injured the hamstring playing for Spain against France in a friendly on Sept.4, is struggling to play more than one match a week.

But he confirmed that Costa, who has scored seven goals in his opening five Premier League games for Chelsea, will start against Aston Villa at Stamford Bridge on Saturday.

"He will start the game without any problems but the question is always the same: Can he finish the game and be in a condition to play against Sporting Lisbon (in the Champions League) 48 hours later?

"He is working with the technical department, with the physios, he is working hard, because mentally he is ready for every game but physically he is not."