The Reds plan to call up Petty from Triple-A Louisville to start Monday's game against the Cubs in Chicago, Gordon Wittenmyer of The Cincinnati Enquirer reports.
The right-hander will fill the rotation spot vacated by Brandon Williamson (shoulder), who was placed on the injured list Thursday. Petty's stint in the big leagues could be brief, however, as Nick Lodolo (finger) is on track to be activated from the IL next weekend. Over six starts with Louisville this season, Petty has submitted a 4.38 ERA, 1.34 WHIP and 29:11 K:BB over 24.2 innings.