Mejia was placed on the 10-day disabled list Tuesday with an upper-arm injury, Rhett Bollinger of MLB.com reports.
The exact diagnosis of Mejia's injury has not yet been announced, though it's being said that the injury occurred in the biceps/triceps region on his left arm. It's unclear how much time the 24-year-old will be forced to miss, but Dillon Gee is the most likely candidate to step into the rotation in the meantime.