Concussions are a tricky injury to deal with because it can be a few days before its full extent can be known. At this point, just over 12 hours after suffering the concussion, Chris Cooley is still awaiting further testing.
Redskins TE Chris Cooley appeared briefly in the locker room this morning. Further tests are on the way. Concussion came earlier in game.
Redskins Insider
RedskinsInsider
The interesting part of that tweet is the last part. It seems to confirm what Fred Davis said earlier about Cooley playing a few series after he suffered the concussion. We don't have any official confirmation from Cooley or the team that this is the case, but at this point it seems like that is what happened.