Left-handed reliever Buddy Baumann is on his way from Triple-A Las Vegas to join the Mets, who have placed Hansel Robles on the 10-day DL (retroactive to May 9) due to a right knee sprain.
Robles left Tuesday's game early due to the knee and received an MRI in New York on Wednesday.
Baumann, 30, has a 0.79 ERA and 1.15 WHIP with 13 strikeouts in 11.1 innings (12 appearances) for the 51s this season.
While Baumann will join the Mets Friday night in Philadelphia, he will be serving a one-game suspension for his involvement in an altercation between the Padres and Rockies that happened on April 11.
Baumann had brief stints in the majors with the Padres in 2016, 2017, and this season.
Of the 11 left-handed batters Baumann has faced this season, he has struck out eight while allowing one hit and walking one.
Baumann will join Jerry Blevins as the second lefty in the Mets' bullpen, though Blevins is expected to be placed on the paternity list in the coming days when he joins his wife for the birth of their first child.