Concussions sidelined three quarterbacks Sunday, with Michael Vick, Alex Smith and Jay Cutler knocked out of games in the first half and leaving their teams wondering about their playing status for next week.
The Eagles' Vick was hit by Dallas linebacker Ernie Sims on an incomplete pass and was slow to get up early in the second quarter of Philadelphia's 38-23 loss. Vick headed for the locker room and was replaced by Nick Foles with the game tied 7-7.
Vick threw a 2-yard touchdown pass to Riley Cooper in the first quarter.
The 49ers' Smith scrambled and started to slide before turning his back late, and Rams linebacker Jo-Lonn Dunbar barreled into his neck area with 1:10 left in the first quarter of a 24-24 tie against St. Louis. Smith briefly grabbed his facemask and grimaced but stayed in the game, throwing a 14-yard touchdown pass to Michael Crabtree in the second quarter.
Colin Kaepernick replaced Smith on San Francisco's next possession. Smith sat on the bench next to 49ers athletic trainer Jeff Ferguson and other trainers before walking to the locker room just before halftime.
The 2005 No. 1 overall draft pick, who was 7 for 8 for 72 yards and the touchdown, started every game for the 49ers last season.
The Bears' Cutler left Chicago's 13-6 loss to Houston after taking a helmet-to-helmet hit from Tim Dobbins. He had just thrown a pass during the first half. On the play, there were offsetting penalties. Cutler was called for an illegal forward pass for being past the line of scrimmage and Dobbins was called for unnecessary roughness.
Cutler stayed in for the rest of the half, but Jason Campbell came out to start the third quarter.
Tampa Bay linebacker Quincy Black was hospitalized for observation of a neck injury after being carted off the field during the third quarter of the Buccaneers' 34-24 victory over San Diego.
Black was injured tackling running back Ryan Mathews for a 1-yard loss, remaining on the ground with just under 4 minutes left in the quarter. The Bucs did not release specifics about the injury, but coach Greg Schiano said the sixth-year pro is expected to be OK.