The assignment moved the Rays' 40-man roster to 38.
Orvella, 28, spent parts of three seasons with the Rays, compiling a 4-10 career mark with a 5.79 ERA and one save. His best season came in 2005, when he went 3-3 with a 3.60 ERA in 37 games.
Bill Chastain is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.