The Mets officially have an overhauled coaching staff.

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Following a calamitous, playoff-less season, the Mets are retaining just three coaches under manager Carlos Mendoza. Otherwise, the eight additional coaches announced Wednesday will be new faces in the team’s dugout.

Among the group, three were previously unreported, all of whom will be joining the major league staff after promotions from the minor leagues:

• The assistant pitching coach will be Dan McKinney, who last season completed his third year with the Mets and first as Double-A Binghamton’s pitching coach.

McKinney is close with several

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