Reading midfielder Brynjar Gunnarsson faces a month on the sidelines as he requires a groin operation.
Gunnarsson has been struggling with the problem for some time and has not featured for Reading since early January.
Reading have decided to send the Icelandic international under the knife in a bid to clear up the problem.
"Brynjar is off to London this afternoon to undergo a procedure," Reading physio Jon Fearn told the club's official website.
"He was progressing well and trained late last week, but he was still having discomfort.
"So, rather than wait until the end of the season we decided to deal with it now and get him pain free and 100 per cent as soon as possible."
The news is a blow for Royals boss Steve Coppell as his side continue to battle against relegation.