If Washington can't go, the Raiders will also consider using fifth-year defensive back Chris Johnson. Johnson has been inactive the past three games and was playing mostly on special teams before that.
"We'd have to change a bunch of things up," Oakland coach Lane Kiffin said. "(Johnson) would be in there and we'd just step up whoever is next."
Asomugha's knee injury has prevented him from practicing this week but the Raiders don't consider the situation serious. An MRI test taken earlier this week revealed no significant damage and the team is hopeful he'll be on the field against the Bears.
Washington, too, is expected to play, although neither play did anything in practice on Thursday. Both walked out to the workouts after practice had began and spent the afternoon as spectators.
"There's always a concern when a guy is not practicing," Kiffin said. "But we think they're all going to practice tomorrow, so they'll all play."