Manchester City have been dealt a setback after it was confirmed that David Silva will be out of action for four weeks with a calf injury.
The Spaniard picked up the knock during Manchester City's midweek 5-2 Champions League victory over CSKA Moscow.
The injury means he is likely to be sidelined for five matches including their home tie against Tottenham and their penultimate Champions League group stage fixture against Viktoria Plzen.
Silva has been in fine form this season and is joint second in the Premier League assist table.
"I don't know how many weeks at the moment, but it could be three or four," confirmed Manchester City manager Manuel Pellegrini today.
News of Silva's injury is compounded by the fact that captain Vincent Kompany is still out through injury.
Both Fernandinho and Matija Nastasic are also struggling with knocks to be fit for Manchester City's clash against Sunderland this weekend.
"It (the Kompany injury) was diagnosed as being a five-week problem," said the Chilean. "That was three weeks ago, so he should be fine in another two weeks.
"We hope if he continues this way he will be fine."
The Citizens will also be without striker Stevan Jovetic for the trip to the Stadium of Light.