Clarke will move back to the bullpen following his spot start last weekend, Jody Jackson of FOX Sports Arizona reports.
Clarke didn't fare well in his start against the Giants, surrendering five runs (three earned) on five hits and a walk over 1.2 innings of work, so he'll transition to a long-relief role. The Diamondbacks have yet to announce who will take Robbie Ray's (back) next turn in the starting rotation, though perhaps another starter won't be needed if Ray gets clearance to return next week.