Cardinals rookie running back Ryan Williams will undergo surgery early next week to repair a ruptured patella tendon in his right knee. Arizona coach Ken Whisenhunt said that the team will be looking to sign a running back soon, if only because one is needed to round out the reps in practice, then keep looking as other teams make roster cuts. "I think that there's a couple of guys out there," Whisenhunt said, "but you've got to do some research as to their role and how are they going to accept that role, because that's important to your team." Williams suffered the injury in a preseason game on Friday night.