It looks more and more that RB Clinton Portis is not going to be able to go Sunday night against the Cowboys. His knee sprain showed no signs of getting any better today, and the back left Redskins Park without speaking to the media about the knee. “I was hoping today that there would be a little more optimism, and there’s not,” coach Jim Zorn said. “He’s still questionable. I would say there’s no change today. I was looking for another jump, but there wasn’t.” Portis sprained his left knee in the 23-6 loss to the Pittsburgh Steelers before last week’s bye. It would be an obvious blow to the offense if Portis has to sit.