According to ESPN's Adam Schefter, Russell Okung has a torn ligament in his big toe, and likely will miss Sunday's game against Jacksonville.
Mike Garafolo of USA Today notes that according to a source it's a partial tear of the plantar plate.
Okung's injury is not good news for the Seahawks. But Seattle does have a backup plan with Paul McQuistan, who played left tackle for Okung against San Francisco on Sunday.
McQuistan also replaced Okung for the last four games of the 2011 season after he suffered a torn pectoral muscle against Philadelphia, so Seattle has been down this road before.
Perhaps more important, Seattle has to make sure to shore up it's depth behind McQuistan, which means rookies Michael Bowie and Alvin Bailey need to be ready to play.