He will be in training for several weeks before attempting to play again.
Andy Campbell has also returned to training after aggrevating a thigh strain in a reserve match a couple of weeks ago.
Daniel Gabbidon hoped to resume full training today and has an outside chance of a place on the bench on Saturday but is more likely to play against West Ham in the Carling Cup next Tuesday.
The early indications are that Lennie will rotate his squad next Tuesday in the game that is live on Sky.
City are without Alan Lee who completes his suspension this Saturday but will be out for another couple of weeks after undergoing surgery on a cartlidge injury.
Squad update - 25 players.
Fit and ready to play. (all on duty at Reading)
Alexander, Weston, Vidmar, Collins, Barker, Langley, Kavanagh, Boland, Earnshaw, Thorne, Margetson, Croft, Bonner, Bowen Gordon.
Injured but close to playing
Daniel Gabbidon, John Robinson.
Injured but back in training
Scott Young / Andy Campbell.
Injured
Alan Lee.
To my knowledge available but not currently in squad
Aaran Lee Barrett, Layton Maxwell, Stuart Fleetwood, Gareth Whalley, Spencer Prior.