Bailey last pitched for the Reds on April 23, 2015, before he needed Tommy John surgery on his right elbow. He made six rehab starts for Louisville, including on Monday, when he threw 98 pitches over 4 1/3 innings.
Over the past calendar year, the 30-year-old Bailey has been limited to five big league starts. In August 2014, he had surgery to repair a torn flexor mass tendon near the same elbow.
The Reds have an open spot in their rotation for Sunday vs. the Padres, however the club has yet to formally name a starter. It remains "TBA," pending an announcement.
Mark Sheldon has covered the Reds for MLB.com since 2006, and previously covered the Twins from 2001-05. Follow him on Twitter @m_sheldon and Facebook and listen to his podcast. This story was not subject to the approval of Major League Baseball or its clubs.