Atlanta Falcons coach Mike Smith says starting middle linebacker Akeem Dent sustained a concussion in the 31-17 loss to Baltimore and will miss next week's exhibition against Cincinnati.
Mike Peterson, a 14th-year veteran, took over for Dent in practice on Saturday.
Rookie fullback Bradie Ewing, a fifth-round pick from Wisconsin, is out for the season after injuring his right knee in Thursday's game.
The Falcons aren't sure when starting defensive tackle Corey Peters (left foot) and reserve defensive tackle Vance Walker (undisclosed injury) will return.
Kerry Meier, the team's No. 4 receiver, missed practice with an unspecified leg injury. No. 3 receiver Harry Douglas returned to practice after being held out of the Baltimore game with a rib injury.