(AP Photo/Susan Walsh)Dwayne Haskins gets his second consecutive start for Washington with quarterback Alex Smith out again because of a right calf injury.
Philadelphia receiver DeSean Jackon is active against Dallas after missing two months with an ankle injury.
Harrison being inactive against the Rams comes as the Seahawks welcome defensive tackle Bryan Mone back from injured reserve following a lengthy stint because of an ankle injury.
The Rams were without rookie running back Cam Akers, who had already been ruled out with an ankle injury.
Washington: QB Alex Smith, RB Lamar Miller, WR Terry McLaurin, OT David Steinmetz, LB Kevin Pierre-Louis, LB Thomas Davis.