Bailey went on the disabled list May 24 with shoulder inflammation and is eligible to return Tuesday. He'll start for the Bats on Tuesday night at Syracuse.
"This is more of a tuneup," Baker said. "Would rather have him tune up there than tune up here. And he thought he was ready for here, but we wanted to make sure."
Baker said Bailey pitched well in a bullpen session Monday, and he expects Bailey to throw around 80 pitches in his rehab start. He last started May 23 at Cleveland, where he allowed three runs in 2 1/3 innings before leaving with the shoulder problem. For the season, he's 1-2 with a 5.51 ERA.
Right-hander Sam LeCure will make his third career start in place of Bailey for the Reds on Tuesday against San Francisco. LeCure split the first two starts of his career with a win over Houston and a loss last Wednesday at St. Louis. If Bailey's start at Syracuse goes well, he could return to the Cincinnati rotation Sunday when the Reds host Kansas City.