The Cowboys added a pair of defensive linemen to help them get through while they are short-handed because of injuries to Anthony Spencer, Jay Ratliff, Tyrone Crawford and Ike Igbinosun.
Defensive tackle Landon Cohen and defensive end George Selvie were signed, and receiver Lavasier Tuinei was released.
Cohen has four years in the league, with Detroit, Jacksonville and New England. He played in 14 games and started four for the Lions in 2009.
Selvie has three years in the NFL with three teams, St. Louis, Carolina and Jacksonville. He has not started any games.
Tuinei, a receiver out of Oregon, did not pass the conditioning test at the start of training camp.