Michael Vick (Eagles, QB): Left in second quarter vs. Cowboys because of a concussion.
Jay Cutler (Bears QB): Did not play in second half vs. Texans because of a concussion.
Quincy Black (Bucs, LB): Carted off the field late in the third quarter vs. Chargers with an unspecific injury, but trainers immobilized his neck and back and strapped him to a stretcher. He was taken to a hospital for observation, but the team expected him to be fine. ... Bucs CB Eric Wright also left the game in the first half because of an ankle injury.
Elvis Dumervil (Broncos, DE): Left game vs. Panthers because of a shoulder injury in the second quarter.
Alex Smith (49ers, QB): Stayed in game long enough vs. Rams after being hit in the first quarter to throw a second-quarter TD pass, then left because of a concussion.
Julio Jones (Falcons, WR): Missed much of the first half vs. Saints because of an undisclosed leg injury, but returned in the second half.