The Marlins designated Monteverde for assignment Sunday.
The 27-year-old was added to the big-league roster and allowed four earned runs over 3.2 frames in his MLB debut Saturday, but he won't retain his place on the 26-man and 40-man rosters. Cade Gibson was called up to replace Monteverde in Miami's bullpen.
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Marlins' Patrick Monteverde: Selected to MLB roster
Rotowire
The Marlins selected Monteverde's contract from Triple-A Jacksonville on Saturday.
Monteverde has appeared in three games for Jacksonville this season, giving up five earned runs while striking out six batters and walking four across 9.1 innings. The 27-year-old southpaw will now join the big-league roster to replace George Soriano and provide Miami with a fresh bullpen arm capable of pitching multiple innings. Monteverde's first appearance with the Marlins will be his MLB debut.