Running back Steven Jackson is active for the St. Louis Rams after missing all practices this week with a groin injury.
Defensive tackle Michael Brockers, the Rams first-round draft pick, makes his NFL debut against Seattle on Sunday. He is coming off a high right ankle sprain.
Jermelle Cudjo, who started the first three games at right tackle, is inactive.
Wide receiver Steve Smith is healthy but not active along with running back Isaiah Pead.
Seahawks right guard John Moffitt is inactive with a knee injury after being listed as doubtful. James Carpenter is starting at left guard and making his season debut coming off a knee injury last November. Paul McQuistan moves to right guard.
Defensive tackle Jaye Howard (foot) is inactive; linebacker Leroy Hill (calf) is active.