The injury is a blow to City who could have started with him at Reading on Wednesday evening. City must now wait until the specialist has seen the player. He could be out for 6 - 8 weeks.
Dave Jones will now look to bring in a replacement but it's not guaranteed.
Jones also pour cold water on newspaper speculation that Ross McCormack could be back this weekend.
The City boss reckons he's at least 2 - 3 weeks away.