David Montgomery, running back for the Detroit Lions, is listed as doubtful for Sunday's game against Atlanta due to a thigh injury. Montgomery did not practice all week and is not expected to play. The Lions will keep the door open with a 'doubtful' designation in case his thigh bruise improves dramatically. The game between the Falcons and Lions will feature rookie running backs Jahmyr Gibbs and Bijan Robinson, but Craig Reynolds and Tyler Allgeier may also see significant carries.