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Sergio Aguero will be out of action for "at least" a month after picking up a calf strain, City boss Manuel Pellegrini has revealed.

The Argentine pulled up during the Blues' 6-3 win over Arsenal, and was replaced by Jesus Navas with 50 minutes gone at the Etihad Stadium.

And he is now set for an ill-timed lay-off during the busy festive fixture list.

"I don't know at the moment. I think he will be out for at least one month," he said.

Pellegrini also confirmed that Micah Richards is set to be sidelined for a month with a hamstring injury while Matija Nastasic isn't fit enough to return against Leicester.

Fixtures Aguero could miss: Leicester (A - League Cup), Fulham (A), Liverpool (H), Crystal Palace (H), Swansea (A), Blackburn (A - FA Cup), Newcastle (A).