A much-needed pitching shakeup is finally coming for the Mets .

The biggest pitching-related news to come out of Queens on Wednesday: Right-hander Nolan McLean will be called up Saturday to make his big league debut against the Seattle Mariners.

Less important, but potentially impactful pitching news: Right-hander Paul Blackburn was activated off the injured list Wednesday, ahead of schedule.

McLean, a 24-year-old prospect ranked third overall in the Mets’ system, is expected to take the place of Frankie Montas in the rotation . Without any starting pitchers available for the right price at the trade deadline, McLean and Brandon Sproat became the fallback plan. Still, the Mets were banking on Montas, Clay Holmes, Sean Manaea and Kodai Senga to improve after the deadline passed.

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