The move came two days after Harris carried 18 times for 42 yards and fumbled against the Baltimore Ravens.
Coach Pete Carroll said Monday that Marshawn Lynch will be rehabbing off-site from surgery associated with a sports hernia injury and indicated that the star running back still has work to do before getting back on the field.
Harris was going to be a popular waiver pickup, but the move now leaves Brown as the most likely candidate to carry the load Sunday against the Cleveland Browns. Brown also has had fumbling issues throughout his career. Seattle has Fred Jackson on the roster, but Carroll said he would likely continue in his third-down role. In a pinch, the Seahawks could turn to fullback Derrick Coleman. And it's possible they make another move this week at running back.