The Seahawks are saying QB Matt Hasselbeck has a sprained knee and that his return to this game is doubtful. He just walked into the tunnel on his way to the locker-room area. We do not know the severity of the injury for sure, but he did take a shot on his right knee and it did appear serious at first. FB Mack Strong actually blocked Vikings LB E.J. Henderson on the play, but Henderson flew into Hasselbeck's legs.