Stephenson will shift to the Reds' bullpen effective Sunday, Bobby Nightengale of The Cincinnati Enquirer reports.
The Reds' move to a five-man rotation sees Stephenson and Sal Romano as the odd men out, as it appears Cody Reed will now get a look in the rotation. Stephenson logged only 10.2 innings across three starts, allowing nine runs and 14 hits with an awful 10:12 K:BB.