Manuel Pellegrini unsure of Yaya Toure hamstring injury

Manchester City manager Manuel Pellegrini has revealed that the club is waiting to discover the extent of Yaya Toure's hamstring injury.

The midfielder was substituted at half time during City's 3-2 win over Aston Villa in the Premier League on Saturday.

Ivory Coast international Toure is now expected to undergo a scan to determine how bad the damage is.

"Toure had a hamstring problem so he couldn't play the second half," Pellegrini told reporters after the game.

"It is difficult to know today what happened, but it was not a precaution. It was a muscle injury and we will see tomorrow [Sunday] or Monday how bad it is."

City continue the defence of their league title on May 3 when they face Tottenham Hotspur at White Hart Lane.