Rams left tackle Rodger Saffold was carted off the Edward Jones Dome turf in the fourth quarter of Sunday's game against the Detroit Lions after undergoing what appeared to be a neck injury.
Saffold crumpled awkwardly after disengaging from Lions safety John Wendling on a long St. Louis pass. The Rams scored a touchdown on the play to take a 20-13 lead with 9:45 remaining.
Saffold remained down for several minutes, and some Rams players held hands and formed a prayer circle on their sideline. Saffold was eventually lifted onto the cart but did not appear to be moving much.
The 6-foot-5, 314-pound Saffold is in his third season with the Rams. He started nine games last season after starting 16 as a rookie.
Safford, who underwent season-ending surgery to repair a pectoral injury in 2011, has impressed in training camp and was looked upon to protect Bradford's blindside.
The Associated Press contributed to this report