With Tony Romo probably out for Sunday's NFC East-division title showdown with the Eagles because of a back injury and Kyle Orton likely to start, Dallas needs to sign at least one more quarterback as a backup.

According to CBS Sports' Jason La Canfora, the Cowboys have worked out Tyler Thigpen, Caleb Hanie and John Skelton and have sent all three home without a contract offer.

The team, therefore, is likely to sign David Carr, who La Canfora writes is conducting a separate workout for the team Tuesday afternoon.