Walker (groin) is present at Thursday's practice but doesn't have a helmet, Bridget Condon of NFL Network reports.
Walker has been out for about a week now, which coach Pete Carroll using the term "week-to-week" to describe his status Monday. Meanwhile, fellow running back Zach Charbonnet (shoulder) is back in action sooner than expected after missing only three practices, giving him a nice opportunity to take more snaps with the starters while Walker remains limited to observing from the sideline.