Tampa Bay Buccaneers running back Doug Martin is inactive and will not play Sunday against the St. Louis Rams.
Martin suffered a knee injury in Tampa Bay's season-opening loss against the Carolina Panthers and had previously been listed as questionable for Sunday's game.
The Buccaneers announced that Bobby Rainey will start.
After an outstanding rookie year in 2012, Martin rushed for just 456 yards last year before suffering a season-ending shoulder injury after six games.
The 25-year-old Martin ran for just nine yards on nine carries last week against Carolina. Rainey filled in, gaining just 20 yards from scrimmage but hauling in a touchdown catch.
The 5-foot-8 Rainey was productive last season as a replacement for Martin, rushing for 566 yards and five touchdowns.