Jon Walters will have a scan this afternoon to see the extent of the injury that forced him to withdraw before half time against Wolves last night.
The injury was sustained when Walters had an akward collision with Matthew Hill on the half-hour mark and must be doubtful for Saturday.
Jim Magilton told the club site: "Jon was pretty sore but we won't know the damage until our medical people have had a good look at him.
"Obviously he has to be a major doubt for the Reading game. We have one or two others with bumps and bruises as well and we will have a body count on Thursday and go from there in preparation for Saturday."