Medina (knee) is on track to begin a rehab assignment next week, Martin Gallegos of MLB.com reports.
Medina is with Oakland on its road trip and is set to throw four bullpen sessions before going out on a rehab assignment. The right-hander is working his way back from the Grade 2 MCL sprain in his right knee that he suffered back in early March. Medina is on the 60-day injured list and thus isn't eligible for activation until late May. It will take time for him to be built back up as a starter, so he likely wouldn't be available before then, anyway.