Hernandez (shoulder) was removed from a June 4 rehab appearance with Single-A St. Lucie due to side discomfort, Anthony DiComo of MLB.com reports.
Hernandez has been out all season with a shoulder injury, and while he appears to be over that issue, he now has a new issue to deal with. The pitcher was able to throw off flat ground Wednesday, but a timetable for his return to game action is unclear.