St. Louis Rams guard Chris Williams was being evaluated for concussion-like symptoms late in the first half against the Chicago Bears.
Williams got attention on and off the field before jogging to the locker room along with medical personnel. The team said his return was questionable.
Shelley Smith replaced Williams, a former first-round pick of the Bears, with the Rams leading 21-14. Williams has started every game at left guard.
AP NFL website: www.pro32.ap.org