The Marlins selected Ramirez's contract from Triple-A Jacksonville on Sunday, Christina De Nicola of MLB.com reports.
The 29-year-old will receive his first taste of the big leagues, taking the roster spot of Kent Emanuel, who was designated for assignment. Ramirez has a 3.86 ERA and 16:4 K:BB over 11.2 innings at Jacksonville this season and should fill a low-leverage bullpen role for Miami.