QPR midfielder Akos Buzsaky needs knee surgery which will rule him out for up to five weeks.
The Hungary international suffered the injury during the goalless draw against Norwich a fortnight ago.
"Unfortunately Akos has got a small tear in a knee cartilage," physio Nigel Cox told Rangers' official website.
"We hoped he would be able to get away with the need for surgery but, in order to ascertain whether that could happen we needed to give the knee time to settle down.
"It has become apparent that he is in too much discomfort. The only option now is surgery to clean up the knee.
"Unfortunately, where the injury is in his knee means the surgeon wants him to take his recovery very carefully so we are looking at four to five weeks of rehab."