Petty will start for the Reds in Friday's bullpen game against the Nationals, C. Trent Rosecrans of The Athletic reports.
Petty has not started a game since early June and shouldn't be expected to cover more than three innings Friday. The right-hander has collected a 4.50 ERA and 14:8 K:BB over 30 innings covering 15 appearances (two starts) for the Reds this season.