Montero is an option to make a spot start Monday against the Dodgers, Mike Puma of the New York Post reports.
With Matt Harvey (shoulder) expected to miss several weeks with his latest injury, Montero could step in to take his next turn in the rotation before the Mets move back to a five-man rotation. The 26-year-old struggled through a pair of spot starts earlier in the season -- allowing eight runs on 12 hits and six walks while striking out eight through just 6.2 innings -- so the Mets may be leaning towards sending out Tyler Pill for the spot start.