Lang has a left ankle injury, while Sitton has a toe injury. The Packers' two best offensive linemen had been listed as questionable after missing some practice time this week. Sitton and Lang were hurt two weeks ago in a loss to the Saints.
Starting safety Morgan Burnett is also active for Green Bay. Burnett has been dealing with a calf injury. He had been downgraded from probable to questionable on Saturday.
Bennett is playing after hurting a rib in practice this week. Chicago's second-leading receiver, with 47 catches, had been listed as questionable for the Packers game.