Harrison (hamstring) has been ruled out ahead of Sunday's game against the 49ers, Travis Wingfield of the Dolphins' official site reports.
Harrison suffered a hamstring injury in the Dolphins' loss to the Raiders last Sunday. The linebacker was unable to practice throughout Week 2 due to the injury and will not be able to suit up for next Sunday's contest. With Harrison out, Jackson Woodard is set to see all the relief snaps behind Jordyn Brooks, Willie Gay and Jacob Rodriguez.