Roeder has virtually written off Shearer's hopes of playing again.
Roeder: "Alan has already had a scan which revealed quite serious medial-ligament damage. In the normal scheme of things we would be talking about eight to 12 weeks as the recovery period.
"There is no point trying to predict accurately how long Alan will be out until we have the results of the scan. But that [eight to 12 weeks] is the possibility if Alan doesn't get the result he wants, although he is remaining - as he has always been in his life - an eternal optimist.
"He is staying positive that he will still be able to play some part in what is left of this season, but at the moment we are guessing. There's nothing wrong with being positive. It can't slow an injury down, and if anything I don't see why it can't help in recovery.
"There's no medical proof of that, but I'm sure if you can stay upbeat and be positive, then it will give you a better chance."
Meanwhile, it has been suggested Roeder could put the GOALden Boy on the pitch for the final minute of the final game of the season at home to Chelsea, so the fans can give him the standing ovation he deserves on the final whistle.