Medina was placed on the 7-day injured list July 2 by Triple-A Lehigh Valley for an unspecified issue, Tom Housenick of The Allentown Morning Call reports.
The 24-year-old right-hander posted a 5.73 ERA and 1.55 WHIP over 10 starts before he was shut down with the injury. Even if he had avoided the setback, Medina wasn't in position to receive a call-up to the big leagues at any point in the near future.