Norwich striker James Vaughan has been ruled out for several months with a knee injury suffered against Sunderland.
Vaughan suffered the problem shortly after coming on as a substitute in Monday's 2-1 win over the Black Cats at Carrow Road.
The former Everton man was forced to limp off the field with the problem just 10 minutes after entering the action.
Scans have confirmed the Canaries' worst fears and Vaughan now faces a lengthy spell on the sidelines.
The injury-hit 23-year-old missed the beginning of the season with a similar complaint, but the latest setback is to the other knee.
Canaries boss Paul Lambert confirmed Vaughan would be sidelined until early 2012.
Speaking to a news conference ahead of the Premier League trip to Old Trafford, the Norwich manager said: "He is going to be out for a considerable time - it is his meniscus.
"It is a blow because he has been looking really good and is going to be out for three or four months.
"He has had really bad luck with injuries."