Yaya Toure suffered a hamstring injury during Manchester City's victory over Aston Villa.
City consolidated their top four hopes with an exciting 3-2 triumph.
One downside was an injury to midfielder Toure, who was feeling his hamstring in the first half and withdrawn at the interval.
City boss Manuel Pellegrini said: "It is difficult to know today what will happen but it was not a precaution. It was a muscle injury. We will see tomorrow or Monday how important (an injury) it is."