The Marlins have designated pitcher Nick Masset for assignment, according to CBSSports.com Baseball Insider Jon Heyman.
Masset will be moved to make room for Henderson Alvarez, who is expected to start on Sunday for Miami once he's activated from the 15-day DL.
Masset has a 2.08 ERA with five strikeouts and one walk in 8 2/3 innings of work.