GREENBURGH — As they got ready Sunday morning to face the struggling Nashville Predators at Madison Square Garden, part of the Rangers’ preparation was trying to assimilate two new guys, young forward Juuso Parssinen and veteran defenseman Calvin de Haan, into their lineup.

The Rangers are four points out of a playoff spot and did not want to let pending unrestricted free agents walk for nothing.

The New York Rangers just pulled off a trade, sending Ryan Lindgren, Jimmy Vesey, and unsigned prospect Hank Kempf to the Colorado Avalanche.  In return, they’re