Pryor suffered the injury on Monday night against the Broncos. He stated on Twitter that he didn't remember some of the game, so he clearly had some concussion symptoms. Although, the Raiders had cleared Pryor to play, they're going to keep their young QB on the sidelines.
It's too bad. The Redskins have been a joke on defense and have allowed an absolutely ridiculous 9.8 yards per attempt this year. Matt Flynn is going to step in and he'll have a shot to produce.
Fantasy impact: It's a little too risky to start Flynn. He has been sacked way too often in the preseason and his receivers aren't talented enough to get on the same page with little practice. Flynn did get some first-team reps, so it wouldn't be a shock to see him go off. He's a risky, high-upside QB2. As for Pryor, he should remain owned in most leagues.