GREENBURGH — Saturday was power-play day for the Rangers as new coach Mike Sullivan continues to implement his new system and philosophies before the regular season begins.

With a day off on Sunday, Sullivan ran an almost two-hour practice with the NHL group, and much of that was spent working on the power play. The most noticeable thing: Forward Alexis Lafreniere, now entering his sixth season, was a big part of the first power-play unit. Lafreniere alternated with Vincent Trocheck on the first unit, joining point man Adam Fox and forwards Artemi Panarin, Mika Zibanejad and J.T. Miller.

Lafreniere and Trocheck also alternated working with the second unit, which had rookie defenseman Scott Morrow at the point along with Will Cuylle, Matt Rempe and rookie Gabe Perreault.

“If we’re going

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