Baltimore Ravens wide receiver Breshad Perriman picked up a knock on his knee at practice Thursday and could be sidelined for a few days, head coach John Harbaugh announced.

There's no indication the injury is serious, but it's discouraging news nonetheless. As with all rookies, the Ravens want Perriman to get as many practice reps as possible.

Perriman, the Raven's first-round pick, is expected to be asked to play a major role on offense opposite Steve Smith.