Chelsea manager Jose Mourinho has confirmed that Diego Costa may miss up to a month due to a hamstring injury.

The striker hobbled off during Chelsea's 2-1 win against Stoke City and was initially ruled out for a fortnight, with Queens Park Rangers and Manchester United the likely games he would miss.

However, in this afternoon's press conference, Mourinho confirmed that he expects Costa to play four out of the remaining eight games.

"Only Diego is injured, everybody else is fine and ready (to play at QPR).

"I think we have eight matches to play, if he plays four it is normal. If he plays three he is a bit below what I am expecting. If he plays five that is more than I am expecting. I am not concerned (by his injury)."