Oakland head coach Art Shell listed Sims as ''very questionable'' to play in Monday night's game in Seattle.
''That thing is a tough thing,'' Shell said. ''All I know is I remember Ted Hendricks having an abdominal muscle (injury) and that thing took a long time. Hopefully, it's not as bad.''
With Sims sidelined, Corey Hulsey and rookie Paul McQuistan have split time at left guard with Oakland's starting offense. Shell would not indicate which player had the upper hand for the job should Sims not play.
Fullback Zack Crockett was also added to the Raiders' injury list after aggravating a knee injury he originally sustained against Pittsburgh. Tyrone Poole (ankle) was also held out of Thursday's workout.
The Seahawks could also go into the game missing starting right tackle Sean Locklear, who returned this week after a one-game NFL suspension. Locklear is nursing a tender left ankle and has been downgraded from probable to questionable.
Not that the Raiders expect Seattle's offense to change much. Defensive end Derrick Burgess, who has four sacks in his last two games, said the Seahawks will stick to their gameplan.
''They're going to run the same things,'' Burgess said. ''Their offense is going to stay the same. It's just going to be a different guy (Maurice Morris) running the ball. Hopefully he ain't in too good a game shape because he's been sitting.''
In addition to Morris replacing Alexander, Seneca Wallace is set to make his second NFL start in place of Hasselbeck.