The Washington Post’s Rick Maese tweets:
zorn has ruled portis out Sunday
This is hardly surprising given the severity of the concussion Portis sustained. It also wouldn’t be shocking if Brian Westbrook’s setback — he suffered a second concussion within three weeks after returning to the field — influences the Redskins to be more cautious with Portis.
Ladell Betts will get the start in Portis’ absence when the Skins travel to Dallas on Sunday.