Cobb (elbow) will move his rehab to Triple-A Durham, Marc Topkin of the Tampa Bay Times reports.
Cobb had been working at High-A Charlotte, but he'll now head up to Triple-A, where he's slated to take the hill Wednesday night. The right-hander remains without a definitive timetable to return to the Rays, but if all goes well at Triple-A he could be back with the big league club sometime later in August.