Kendall Wright is listed on the injury report as having a concussion. He told reporters after practice today that he doesn't think he has one. Wright apparently met with doctors today, and there is a chance he could practice tomorrow according to Mike Munchak.
He will have to be symptom free before he can return to practice. It sounds like there is a chance he could practice tomorrow. If he does he will play on Sunday. If he doesn't the chances of him playing on Sunday are 50/50 at best.
As an aside, how awesome #sarcasm is it that Andre Johnson has been practicing all week. Kareem Jackson and Bernard Pollard were fined the exact same amount for their hits in the game on Sunday, even though Jackson was flagged and the guy he hit (Wright) might miss a game. Great job NFL!