Yarbrough will serve as a bulk reliever behind opener Brent Honeywell in Saturday's game against the Blue Jays, Marc Topkin of the Tampa Bay Times reports.
Yarbrough made his first three appearances as a traditional starter, but he'll work behind an opener for a second consecutive outing Saturday. The southpaw has posted a 5.40 ERA and 1.34 WHIP in 21.2 innings across his first four appearances of the year.