Reading captain Andy Yiadom is to miss the two remaining League One fixtures after suffering a knee injury.
The 31-year-old has not featured since limping off against Bristol Rovers a fortnight ago, with Kelvin Abrefa earning his first league start on Saturday at Barnsley.
The Royals travel to Burton Albion tomorrow for the final away fixture of the season before hosting Blackpool on the last day on April 27.
"It is a very important procedure we need to do with him now," Selles told the media. "The sooner we do it, the better. He is not fully available to play football matches so that makes the decision easier. We now want to be sure that if he does the procedure now and starts his recovery now, he can start pre-season.
"He missed a big part of pre-season last year and scientific reasons say that if you don’t make pre-season then you have a bigger risk of injury during the season. Right now he is not available and we don’t want to risk a 50-50 situation with him. We want him to be available from the first day after the summer."
For the trip to the Pirelli Stadium, defender Tom Holmes is also set to be out of action, while his fate is not yet clear for Blackpool.
"Tom had an incident a couple of days ago in training- a low-grade sprained ankle," Selles confirmed. "He is going to miss this game and we need to see if he will be available for the last game of the season. Andy Yiadom is not going to be available for tomorrow and I don’t think he will be available for the last day. The couple of doubts on Joel Pereira and Jeriel Dorsett will be available for tomorrow."
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