Montero was recalled by the Mets on Tuesday, Adam Rubin of ESPN New York reports.
Steven Matz's disastrous start Monday led to the Mets' bullpen being taxed for 7.1 innings of work, which led the club to call up Montero to provide a fresh arm in the back end. Montero, a 25-year-old right-hander, last pitched at Triple-A Las Vegas on Thursday, allowing one earned run in five innings of work. He would be the likely candidate to eat up some innings if the Mets have another starter fail to make it deep into a game. No corresponding move for Montero's placement on the active roster has been made at this time, though the Mets can place Jacob deGrom on the paternity list.