Graham Stack has had an operation to cure a cartilage problem and is now unlikely to play for Wolves again.
The reserve keeper is currently on-loan at Molineux from Reading and was due to stay at the club until January.
He picked up the injury during training last Friday and went under the surgeon's knife on Sunday. Early indications show that he is likely to be out of action for up to six weeks, which if correct, would take him past the end of his current deal with Wolves.
The injury also comes as a blow to Mick McCarthy who now has only Carl Ikeme, who has only recently returned from a knee injury, as back-up for first team keeper Wayne Hennessey.
"We expect Stacky to be out for between four and six weeks, although he thinks he'll be quicker than that," McCarthy told the club's official website.
"Carl has been chomping at the bit to get back. I asked him if he was fit and he said he was.
"He is a player with a lot of ability so it's good to have him back."