MIAMI — Preaching next man up on offense is one thing. Replacing OG Anunoby on defense is another entirely.

The Knicks were already struggling to string together consistent stops with their $212.5 million defensive linchpin in the lineup. Now, with Anunoby sidelined for at least two weeks due to a left hamstring strain, even more pressure falls on the collective to fill the void — not just his three-point shooting, but his versatility, physicality and game-swinging presence on the defensive end.

“[OG’s absence is] big time. He’s a big part of what we do especially on that end,” sixth man Jordan Clarkson said after shootaround at Kaseya Center on Monday. “With him being out, we’ve all gotta lock in on that end.”

The Knicks (8-4) enter Monday’s rematch against the Heat (7-3) owning the

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