Feyereisen was placed on the 15-day injured list Friday with a right shoulder impingement.
Feyereisen pitched one-third of an inning Thursday, but appears to have come up lame after the appearance. He'll now be away from the team for multiple weeks while nursing his throwing shoulder, potentially looking at an extended absence. Calvin Faucher was recalled from Triple-A Durham on Friday to take his spot in the bullpen.