Tiki Barber said Tuesday the thumb he sprained in Sunday night's loss to the Bears won't prevent him from playing this Sunday at Jacksonville. But he hasn't tried to grip a ball with his right hand since suffering the injury. "It's more a pain in the butt is what it is," the running back said as he signed autographs for patients at the Cancer Institute of New Jersey, where he was promoting awareness of sickle cell disease and its complications. He wore a cast on his wrist that kept his thumb immobilized.