Alvarado was optioned to Triple-A Durham on Tuesday.
Alvarado has made 21 appearances out of the Rays' bullpen this season but is currently sitting on an unsightly 5.89 ERA. He'll be sent to Triple-A Durham to work on his form with the hopes of rejoining the major-league club at a later date. As per Marc Topkin of the Tampa Bay Times, Alvarado has been asked to specifically work on throwing his curveball for strikes more often, as well as to experiment with a cutter/slider in order keep hitters honest with respect to his fastball.