Adama Traore is out for up to two months with a broken bone in his foot.
Traore was injured in the latter stages of the Sunderland match.
The injury to the winger is worse than first feared.
The former Barcelona man will now be absent for eight to ten weeks.
Alan Hutton, Carlos Sanchez and Gabby Agbonlahor are all doubts for the Wycombe game.
Hutton looks set to miss out with a hamstring problem picked up at Sunderland.
Sanchez, who missed the Black Cats match, is also struggling with the same issue.
It is thought that Sanchez is ahead of Hutton in his rehabilitation.
Gabby Agbonlahor may also be absent against Wycombe, too.
His back injury is improving but this weekend could come too soon for the long-serving striker.