Manchester City manager Roberto Mancini has revealed that striker Sergio Aguero is out of tomorrow's meeting with Sunderland and admits he is not sure when he will return.

The Argentine missed the 1-1 draw with Stoke City last weekend and is set for more time on the sidelines with what Mancini has described as a 'stupid' injury.

"It is a stupid injury," said Mancini.

"It was not his fault but he can't play with this injury; for one day, 10 days or two weeks. I don't know."

He added: "I prefer not to say (what the injury is).

"But he couldn't play against Stoke and can't play tomorrow. I hope he can recover for Arsenal next weekend."

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