NEW YORK -- The New York Mets have called up right-hander Rafael Montero from Triple-A Las Vegas, although he will not be active Tuesday night. The move comes a day after the bullpen was forced to log 7 1/3 innings on Monday in relief of Steven Matz, who was knocked out in a seven-run second inning by the Miami Marlins.

Montero was selected over left-hander Sean Gilmartin.

The Mets will keep Montero in limbo on a taxi squad and consider activating him on Wednesday -- or not at all.

Manager Terry Collins indicated that the Mets could use Logan Verrett on Tuesday night if Noah Syndergaard is knocked out early, then have Montero start on Wednesday. If Syndergaard pitches deep into the game, Verrett can proceed with Wednesday's start as planned and Montero can return to Vegas, having gone unused.

The corresponding roster move if Montero ultimately is activated is unclear, but could affect Jacob deGrom.

Rafael Montero was called up after the Mets bullpen was forced to pitch 7 1/3 innings on Monday. AP Photo/John Raoux

DeGrom departed Citi Field on Monday afternoon bound for Florida after getting word his wife, Stacey, was due to deliver the couple's first child. She gave birth to son Jaxon Anthony deGrom at 9:23 p.m. ET that day. He weight seven pounds, 12 ounces.

DeGrom already had been scratched from Wednesday's start against the Marlins because he was dealing with right lat tightness. Verrett is scheduled for the spot start in place of deGrom in the series finale, which left Verrett unavailable to soak up innings after Matz's short start Monday.

The Mets prefer to play a pitcher short and avoid an immediate roster move with deGrom. But the heavy bullpen use in the series opener forced contingencies to be put in place.

If deGrom lands on the DL because of the lat issue, the stint could be backdated to deGrom's last start and he would be eligible to return April 24. If deGrom went on paternity leave for one to three days, the ability to backdate any future DL stint if the lat issue persisted would be lost.

Alternatively, the Mets could make another roster maneuver, such as by temporarily demoting Hansel Robles. He logged 2 1/3 innings and tossed a career-high 52 pitches Monday.

The 25-year-old Montero once was held in a high regard, but he spent April 30 through the remainder of last season on the disabled list with a nebulous shoulder issue, which irked Mets officials.

Montero tossed five innings for Las Vegas in the Pacific Coast League club's opener last Thursday. He allowed two runs (one earned), three hits and two walks in an 81-pitch effort against Fresno.

Gilmartin, who is due to start for Las Vegas on Tuesday night, has not pitched in a game since logging an inning against the Chicago Cubs in the exhibition finale 11 days ago. He last tossed multiple innings in a three-inning appearance against the Marlins in a Grapefruit League game on March 29.