The Mets will call up top pitching prospect Nolan McLean to make his MLB debut this Saturday, reports SNY’s Andy Martino. He’ll step into the rotation spot vacated by Frankie Montas’ move to the bullpen. Jon Heyman of the New York Post reported earlier this morning that righty Paul Blackburn was also headed to the bullpen when he’s ready to be reinstated from the injured list, setting the stage for either McLean or fellow prospect Brandon Sproat to make his debut.
As we noted yesterday when the Mets moved Montas to the ’pen, the Saturday start aligns far better with McLean’s turn in the Triple-A rotation than with that of Sproat. McLean has also simply outpitched Sproat this season, though both well-regarded prospects have excelled recently.
The timing of the move likely isn’t a coincidence. Saturday marks the first day on the calendar where there’s not enough time remaining for players to accrue enough service to exhaust their rookie eligibility. By waiting until Saturday to promote McLean, the Mets have ensured that he’ll still qualify as a rookie next season and therefore still be able to earn the Mets potential future draft picks via the league’s Prospect Promotion Incentive (PPI) program. In all likelihood, McLean is just one of several top prospects around the league who’ll be promoted after Aug. 15.
McLean, 24, was the Mets’ third-round pick in 2023. He’s rated as one of the system’s more promising young arms since that selection, but his stock has exploded in 2025 as he’s ripped through Double-A and Triple-A lineups. McLean has pitched a combined 113 2/3 innings between those two levels and compiled a tidy 2.45 ERA while punching out 27.2% of his opponents. His 10.7% walk rate is still too high, but his huge 54.7% ground-ball rate can help to erase a few of those free passes by way of the double-play ball.
This year’s terrific run has not only vaulted McLean toward the top of the Mets’ in-house prospect lists — it’s made him a consensus top-100 prospect in the sport. He sits 37th among all big league prospects at MLB.com, 40th at Baseball America and 53rd at FanGraphs on each outlet’s post-deadline reranking of the sport’s top young talents.
The 6’2″, 215-pound McLean is an Oklahoma State product whose athleticism draws plenty of praise. He was a two-sport star in high school, playing both baseball and football, and he was a two-way player at OSU, where he was a third baseman and outfielder in addition to his work on the mound. He’s since dialed in only on pitching and experienced an uptick in velocity, now sitting 95 mph with a four-seamer that can climb to 98 mph when he needs to reach back for a bit extra. MLB.com’s report on McLean calls his sweeper a “monster” of a pitch with “elite” spin rate. He’s sitting 85.5 mph with that pitch and also mixing in a sinker, cutter and seldom-used changeup.
Because McLean will retain rookie eligibility going into next year, he could earn the Mets a draft pick down the line. If McLean were to win National League Rookie of the Year or finish top-three in NL MVP voting next season, the Mets would gain that pick. Even if McLean doesn’t hit either of those goals, the fact that he’ll be a top-100 prospect who accrued a full year of service as a rookie opens a three-year window for him to net the Mets a compensatory pick based on award voting. If McLean were to land any top-three finish in Cy Young or MVP voting before reaching arbitration, the Mets would still gain a pick. Players can only net their team one pick under the league’s PPI program, but the timing of his promotion means McLean could do so at any point from 2026-28.
Setting aside the PPI aspect of the promotion, McLean’s promotion comes at a time when he cannot accrue a year of service this season. He’ll be controllable for at least six full years beyond the current campaign — potentially more than that, depending on whether he’s optioned at any point in the future. The earliest he could become a free agent would be after the 2031 season, and the earliest McLean could qualify for arbitration would be following the 2028 season.