Video: Jose Mourinho talks about why Diego Costa won't play every match

Chelsea manager Jose Mourinho has revealed that his decision to start Didier Drogba in their opening UEFA Champions League game against Schalke was not to save Diego Costa for Sunday’s clash with Manchester City.

"Costa has a problem," said Mourinho.

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

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

"It was not to protect for the game Sunday (at Manchester City) it was because today he was not in a condition to start the game."

Drogba missed a great chance to give Chelsea a 2-0 lead which later proved costly as the away side equalised on the hour mark to cap off a frustrating night for the London club.

Mourinho then took a jibe at the Spanish national team and said Chelsea would deal with the problem the national team created.

"He played here one match and he was perfect," The Portuguese said.

"He went to the national team and after the game against France he came back to us injured.

"He came to us (from Atletico) and he was completely fine. He had a problem again in the national team, not with us.

"Now we have the problem and now we have to resolve the problem the best we can.

"Today he was not in condition to play. Sunday we believe he is.

He pointed out saying that until the forward’s muscle injury heals completely, he will need a week to recover from a match

"Next week against Bolton (Capital One Cup) for sure he isn't. We have to manage the situation until the moment he's completely fine.

"If today he starts the game, for sure he cannot play on Sunday. We have to go step by step."

You can check out Mourinho talking about his star striker in the video below.