Wolves midfielder Dave Jones is out for two months after knee surgery.
The 24-year-old suffered the setback against his former club Manchester United in the Carling Cup at Old Trafford.
Wolves boss Mick McCarthy confirmed: "Jones has had a clean-up operation in his knee and will be out for two months.
"He felt it against Manchester United and thought it was just a bit of swelling. He tried to train in the build-up to the Sunderland game but it wasn't right.
"He had a scan and has had the surgery on the knee."