Advantage Steelers?

Posted by ESPN.com's James Walker

The Dallas Cowboys offense will suffer a big blow Sunday as ESPN's Ed Werder reports starting tailback Marion Barber didn't make the trip with the team to face the Pittsburgh Steelers.

Barber has been dealing with a dislocated toe and his chances of playing decreased as the week went along. A source told Werder, "It's too bad because Marion was built for these conditions." The temperature in Heinz Field is expected to be in the high-20s with mud and a chance of snow flurries.

Without Barber, the Cowboys could quickly become one dimensional Sunday against Pittsburgh's top-rated defense. The Steelers often feast on teams that are forced to pass this season, because they can bring a lot of pressure with outside linebackers James Harrison and LaMarr Woodley. The Steelers lead the NFL this year with 42 sacks.

With a win Sunday and a loss by the New England Patriots (7-5) and Miami Dolphins (7-5), Pittsburgh (9-3) can clinch a postseason berth. Dallas (8-4), meanwhile, is fighting for a wild card spot.