Manager Kevin Cash said that Feyereisen (biceps) will begin a rehab assignment with Triple-A Durham on Wednesday, Neil Solondz of the Rays Radio Network reports.
Feyereisen hasn't pitched since July 20 because of right biceps tendinitis. He most recently tossed a live batting practice session Friday, and now he's been granted clearance to pitch in a rehab outing with Durham. The right-hander will likely need to get multiple appearances under his belt before he's activated, but he appears to have a solid chance of rejoining the Rays' bullpen by the end of August.