Both players were game-time decisions, but neither player was placed in the inactive list.
Clemons suffered a hyperextended elbow on Sunday against the Tennessee Titans. He participated on a limited basis in practice Wednesday.
Campbell was taken off the field Sunday with a bruised spine in the loss to the San Francisco 49ers. Both Campbell and Clemons were listed as questionable for Thursday's game.
One of the inactives for Seattle is middle linebacker Bobby Wagner, who will miss his second consecutive game with a high ankle sprain. The other inactives for the Seahawks are quarterback B.J. Daniels, fullback Spender Ware, offensive tackles Breno Giacomini and Caylin Hauptmann, defensive end Benson Mayowa and rookie defensive tackle Jordan Hill.
The inactives for Arizona include wide receiver Brittan Golden, quarterback Ryan Lindley, running back Ryan Williams, linebackers Dontay Moch and Kenny Demens, guard Earl Watford and tight end D.C. Jefferson.