Pryor sustained the injury in his side's defeat to the Denver Broncos on Monday night when he was hit by linebacker Wesley Woodyard, which knocked him out of the game.
Allen told reporters: "I like the progress that I've seen out of him over the last few days. We're going to continue to monitor him but he has made some significant progress.
"We haven't made that decision yet. The biggest thing is, I like where he is at, I like where he is at mentally.
"Medically we're going to continue evaluate him, he's cleared but we're going to get one more evaluation on him tomorrow to see how he responds."
The Raiders face the Washington Redskins on Sunday.