Mets C Kevin Plawecki, RHP Gerson Bautista, and RHP Hansel Robles will join the Mets in Atlanta for potential activation.
Plawecki, who has been sidelined since May 11 has been playing in rehab games as he works his way back from a hairline fracture in his left hand.
He caught nine innings for Triple-A Las Vegas on Saturday and hit a two-run homer on Wednesday night. His grip strength improved earlier in the month and he started hitting shortly thereafter.
In the meantime, the Mets have carried catchers Devin Mesoraco and Tomas Nido.
Bautista and Robles are re-joining the Mets after the team announced that AJ Ramos is heading back to New York to be evaluated after he felt shoulder tightness on Saturday.
Bautista, who made his major league debut earlier this season, is 1-0 with a 6.97 ERA in seven games with Triple-A Las Vegas.
Robles is set to re-join the team after making three rehab appearances with Triple-A Las Vehas this week in his return from back from a sprained right knee.