Stephenson (elbow) is set to begin a minor-league rehab assignment Friday with Triple-A Indianapolis, Justice delos Santos of MLB.com reports.

EDGE Analysis

Stephenson was placed on the 15-day injured list on Opening Day, retroactive to March 27, after being slowed this spring by lingering right elbow soreness. But he is on track now to perhaps join the Pirates' bullpen as soon as he is first eligible for activation.