May will join High-A Rancho Cucamonga when he heals from an undisclosed injury, Jim Callis of MLB.com reports.
There was no report of the nature of the 21-year-old's injury, but it could be related to the undisclosed issue he dealt with last season at Low-A Great Lakes. May posted a 3.88 ERA and exhibited great control (4.3 K/BB ratio) in 23 starts last season, and he will look to build on that success at the next level upon his activation.