The NFL Players Association wants to find out if the Oakland Raiders followed NFL protocol in the team's handling of quarterback Terrelle Pryor's concussion Monday night.

As first reported by Fox Sports, the NFLPA is reviewing the sequence of events that followed a fourth-quarter hit on Pryor by Broncos linebacker Wesley Woodyard. Pryor wasn't examined for a concussion after the hit and remained in the game for two plays.

Raiders coach Dennis Allen on Wednesday reiterated his stance from a day earlier that the Raiders acted in a responsible manner.

"I feel confident that we followed the protocol and did what we were supposed to do," Allen said in his news conference. "We all understand the emphasis placed on player safety specifically in this regard. We don't ever want to put a player out there and put him in danger."

Oakland Raiders quarterback Terrelle Pryor (2) gets up off the turf after being sacked by the Denver Broncos in the third quarter of an NFL football game,
Oakland Raiders quarterback Terrelle Pryor (2) gets up off the turf after being sacked by the Denver Broncos in the third quarter of an NFL football game, Monday, Sept. 23, 2013, in Denver. ((AP Photo/Jack Dempsey) )

Pryor did not practice Wednesday, though he was involved in team meetings. Allen said Pryor still is undergoing tests as outlined in the league-mandated protocol for players that suffered a concussion.

Given the fact cornerback Tracy Porter was cleared to practice Wednesday, despite also suffering a concussion Monday night, Pryor's concussion has been deemed more severe.

Porter cleared the initial phase of the testing, Allen said. There's one more phase for Porter to pass before he's cleared for full contact and to play in a game. Pryor hasn't passed the initial phase.

"We're going to follow it and do what we're supposed to do," Allen said. "Really, it's a matter of when the medical personnel feel like he's fine and he's cleared to practice and play, then he'll be out there practicing and playing."

Pryor has not spoken with the media since his injury, per league rules. Players that suffer concussions aren't allowed to speak with the media until they are cleared to return to action.

Pryor sent out three Tweets on Tuesday morning that sent mixed signals about his well being.

One said that he didn't remember much from the Broncos game and had no idea which player hit him on the play in question. On two subsequent Tweets, Pryor said he was doing well and will be ready to go before long.

The NFL said earlier that it believed the Raiders did follow the right procedures after Pryor was injured. Allen said Pryor didn't exhibit signs of a concussion when he spoke with his quarterback after the play.

"Obviously he took a good shot, they were reviewing the play," Allen said Tuesday. "Terrelle came over, we were talking about the next play. He didn't show any signs of any concussion or anything like that. We put him back in the game and then when he came over to the sideline that's when our medical people took a look at him and decided we needed to send him into the locker room for further evaluation."

Two plays after the hit and the series was over, Pryor was escorted to the locker room by Raiders medical personnel to get examined. He was later diagnosed with a concussion.