The England Under-21 international dislocated his left shoulder during his side's Barclays Premier League defeat to Chelsea on Saturday and has undergone keyhole surgery.

Manager Sven-Goran Eriksson said: "He is out for the rest of the season, but hopefully he will be okay when we start pre-season.

knee operation

"The doctor has told me he will be out for three months.

"He had surgery today, but I'm told that at this stage it looks good although he is going to be out for a long time now."

The 21-year-old joins fellow defender Micah Richards - who recently had a knee operation - on the sidelines.