Scott, who has started 110 consecutive games, hurt his neck late in Thursday's practice.
Coach Mike Munchak says Scott's full strength did not come back Friday as they expected, so the guard was sent for an MRI exam to make sure.
Matt Hasselbeck practiced fully with his thumb and is listed as probable.
Safety Chris Hope (left forearm) and linebacker Colin McCarthy (hamstring) are out again.
Copyright 2011 by The Associated Press