Rays put Jeff Niemann on 15-day DL
The move was retroactive to March 28 and announced before Friday night's game against the Cleveland Indians.
Niemann has yet to appear in a game this season. He competed for the fifth spot in the rotation during spring training and was moved to the bullpen after Roberto Hernandez won the job.
Right-hander Brandon Gomes was recalled from Triple-A Durham to fill the roster opening.
Copyright 2013 by The Associated Press