The big arms are coming, and not just Matt Harvey and Zack Wheeler.

While the attention has been focused on the Big Two, other young names are coming into focus for the Mets and make no mistake the Mets are going to need these arms especially since the Johan Santana situation looks to be so troublesome.

From the day he took over until now, this is what general manager Sandy Alderson thinks about the Mets’ pitching: “Substantially better.”

“Over the last two years we’ve acquired some good pitching in trades, we’ve signed some outstanding pitching in Latin America and we’ve also been successful drafting both college and high school pitchers in the draft,” he said. “It’s definitely a strength that we have.’’

Two of those arms were on display in the 5-2 win over the University of Michigan at Tradition Field — Hansel Robles and Rafael Montero.

Robles was in Class A Brooklyn last season and ended the year with 45 innings without allowing an earned run. He was added to the 40-man roster. He pitched a scoreless inning yesterday. Montero threw two scoreless innings.

Other names include Jeurys Familia and Jenrry Mejia. Gonzalez Germen has impressed, too.

“The power arms are important to have, it’s a marker of future success,’’ Alderson said.

Manager Terry Collins envisions power arms coming out of his bullpen.

“To know that those kinds of arms are coming, that’s a big thing,’’ said Collins, who will need all the pitching help he can get.

Veteran catcher John Buck has been working with some of these young pitchers and has been around long enough to honestly gauge prospects. He said he has been impressed with what he has seen from these young Mets pitchers.