Gagnon was recalled from Triple-A Syracuse on Monday.

Gagnon will provide a fresh bullpen arm for the Mets after the team used up six relievers in the past two games. The 28-year-old made his big-league debut last season, compiling a 5.25 ERA and 8:5 K:BB in 12 innings. Luis Guillorme was sent to the minors in a corresponding move.

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