Both had been listed as questionable. Campbell was strapped down and carted off the field in San Francisco on Sunday with what Arizona coach Bruce Arians said was a bruised spine. Clemons did not practice Monday and Tuesday and was limited Wednesday with an elbow injury.
The injured inactives had already been declared out, including Cardinals wide receiver Brittan Golden (hamstring) and Seahawks linebacker Bobby Wagner (ankle). K.J. Wright moved to Wagner's middle linebacker spot and Malcolm Smith took Wright's outside linebacker spot.