The Oakland Raiders are concerned about the state of Terrelle Pryor's injured knee.

Pryor was limited by the injury suffered against the Philadelphia Eagles in Week 9 in the Raiders' loss to the New York Giants.

"It wasn't something that we thought was going to be a big factor going into the game. But, obviously, it was a factor," Allen told reporters, per the Bay Area News Group.

"It was obvious that there wasn't that explosiveness that we had seen out of him prior to the injury. I'll sit down and visit with Terrelle a little bit more and find out exactly where he is physically."