Carroll said Polumbus would only play in a backup role, while Pitts missed practice Friday to attend a funeral.
"Russell is as doubtful as you can get, but you never know," Carroll said. "Tyler worked out here today and got some work done. So we'll have to figure it out, that'll be a game-time decision for us to see how (Polumbus) responds all the way to Sunday."
Because of injuries, Seattle could be down five starters between the offensive and defensive lines. The Seahawks are without defensive end Red Bryant, placed on injured reserve this week, and defensive tackle Colin Cole. Fellow tackle Brandon Mebane is questionable because of a lingering calf injury that has cost him the last three games.
About the only positive in Seattle's injury news was wide receiver Mike Williams' return to practice Friday. Williams has been bothered by a bruise just above his knee that limits his range of motion and doesn't allow him to completely bend his knee.
Williams knows there is some unknown with Whitehurst about to make his first start -- and throw his first pass in a regular-season game. But getting some time in practice Friday helped him adjust to some of the differences from Seattle starter Matt Hasselbeck, who's out this week with a concussion.
"To get out there today and get adjusted to his speed, it's different," Williams said about Whitehurst. "He's throwing the ball a little different. It's coming out faster, a lot more zip, almost will knock you over. ... We're excited for him, as an offense, I think as a team."
Williams had just one catch last week against Oakland, after catching 21 passes for more than 200 yards in the previous two games combined. He also dropped a potential touchdown midway through the third quarter that could have cut the Raiders' lead to 13-7.
"I couldn't imagine having to wait another week to get out there and get back on track," Williams said.
Copyright 2010 by The Associated Press