The Padres called up Reynolds from Triple-A El Paso on Friday.
Reynolds is set to join the big-league roster with Wandy Peralta (groin) headed to the IL in a corresponding move. Reynolds was traded to San Diego from the Marlins last August and has appeared in 29 games with El Paso this season, three of which were starts. He'll pitch out of the bullpen for the Padres, and he'll be making his MLB debut if he gets into a game.