PITTSBURGH — From the first day of training camp, Jonathan Drouin and Bo Horvat have been stapled together on the second line, just the way Horvat and Mat Barzal used to be.

Isles coach Patrick Roy’s plan to move Barzal back to center needs a lot to go right in order to work. Drouin and Horvat forming two-thirds of a productive second line may not be the top item on the list, but it’s high up.

“I think really good,” Drouin told The Post of his chemistry with Horvat. “Especially that last [preseason] game, obviously we had zero points, but a lot of looks, a lot of good plays. Emil [Heineman’s] doing a good job, too, on that line. He’s a great addition.”

Drouin, who signed with the Islanders on a two-year, $8 million deal this offseason, is the only new veteran on a team with plenty of ne

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