Yarbrough (groin) will make a second rehab start for Triple-A Durham on Thursday, Marc Topkin of the Tampa Bay Times reports.
Yarbrough made the Opening Day roster but hit the injured list with a groin strain prior to making his season debut. He struggled during his first rehab start Saturday, walking four and allowing two runs (one earned) on one hit while retiring just a single batter. He'll need at least one more outing to demonstrate that he's ready to return before the Rays feel comfortable activating him.