Per the DMN blog:
Rookie RB Felix Jones will be placed on the injured reserve and will have surgery to repair a torn ligament underneath his left big toe.
The Cowboys will really be relying on Marion Barber now, and Wade Phillips will have to overcome whatever bugs him about Tashard Choice. In today's NFL you cannot make it very far without some sort tandem backfield that helps to relieve your main guy. Marion Barber is one hell of a running back but we need him to stay as fresh as possible. Right now Barber is one pace for nearly 400 touches this season.