Sports Chelsea carefully managing Diego Costa's hamstring

Chelsea manager Jose Mourinho has revealed that Diego Costa cannot be playing multiple games in quick succession because of his injury concerns.

The Spaniard has dodgy hamstring issues,and it is understood that Chelsea are managing it in order not to have him out on a long-term.

Costa was a second half substitute in Chelsea's 1-1 draw against Schalke 04 on Wednesday,replacing Didier Drogba in the 74th minute.

Mourinho refuted suggestions that Costa was being saved for this weekend's game against Manchester City

"If he has one week to let the muscle recover he can start."

"It was not to protect Costa for the game on Sunday, it was because he was not in condition to start the game," added Mourinho.

"Playing on Saturday, three days is not enough for him to recover."

Costa has hit the ground running in England,scoring seven goals in four matches in the English Premier League.