Cowboys hope David Carter can contribute

IRVING, Texas -- Tuesday afternoon the Cowboys released defensive tackle Landon Cohen, who played in the first two games as a backup, and signed David Carter.

Carter, 6-foot-5, 300 pounds, was cut by the Arizona Cardinals before the start of the season. Coach Jason Garrett isn't sure if Carter, who played against the Cowboys in the preseason, will be ready for Sunday's game against St. Louis.

"We just like him and our [personnel staff] tracks a lot of players," Garrett said. "Guys on rosters, guys on practice squads and guys on the street. You're always trying to upgrade your football team. I think our guys do a really good job of that when there's an opportunity to upgrade or bring a guy in to see where he is. To see if he can possibly upgrade [your team] you want to take advantage of that."

The Cowboys' defensive line has been hammered by injuries. Defensive tackle Jay Ratliff is currently on the physically unable to perform list still recovering from wrist and groin injuries, and defensive end Anthony Spencer made his debut in Week 2 at Kansas City after missing the first game because of knee surgery.

Toward the end of the Week 2 loss to the Chiefs, defensive end DeMarcus Ware suffered a stinger in his shoulder after hitting quarterback Alex Smith. Ware left the game and didn't return, yet team officials don't consider it serious.