San Francisco defensive end Junior Bryant was taken off the field on a stretcher after landing helmet first on the artificial turf in the third quarter of the 49ers' 41-24 loss in St. Louis.
Bryant returned home Sunday on the team's charter after a CT scan showed no neck fractures or any neurological damage.
Bryant didn't move for a few moments after hitting the turf. His head was immobilized and his legs and chest were strapped to the back board before he was removed.
Following the game, coach Steve Mariucci said Bryant was feeling some pain in his neck, and was diagnosed with a neck strain.
Buffalo tight end Jay Riemersma left the Bills' 27-14 loss to the New York Jets with a jammed knee, and Bills linebacker Corey Moore left with a sprained ankle.
Detroit lost three starters to injury in its 31-10 loss to Tampa Bay.
Pro Bowl linebacker Steven Boyd left for the second straight week with a back injury, and cornerback Terry Fair missed the last three quarters with a hyperextended right knee. Both players will be re-evaluated during the week, while offensive lineman Aaron Gibson (concussion) is expected to be fine.
Pittsburgh running back Richard Huntley left a 23-20 loss at Cleveland with a hamstring injury in the first half and didn't return.
Moses Moreno, making his first start at quarterback for San Diego, was 11-of-22 for 107 yards before leaving the 42-10 loss to Kansas City with a shoulder injury.
Denver running back Terrell Davis was in uniform for the Broncos' 33-24 victory in Oakland, but did play after determining in warmups that his sprained left ankle wasn't properly supporting his weight.
Giants defensive back Ralph Brown bruised a kidney in a 14-7 win and will remain in Chicago for observation.
The Bears had a long list of injuries after the game. Receiver Bobby Engram and center Olin Kreutz had sprained knees, defensive end Phillip Daniels a quad contusion and defensive back Frankie Smith a hamstring strain.