This from Rick Maese’s twitter:
Zorn says Clinton Portis is doubtful. He visited doctors today.
If Portis is unable to go Saturday when the Redskins travel to Dallas on Sunday, Ladell Betts will get the majority of carries in his place. The Skins indicated earlier in the week that they would take their time with Portis, especially given how well Betts has run the ball in his stead.