The Islanders had just come off the ice after their thrilling overtime win against the Penguins in Game 1 on Sunday in Pittsburgh and head coach Barry Trotz said it was already in their rearview mirror.

By the time Monday rolled around and the team had an optional practice — only attended by players who didn’t participate in the series opener — the Islanders continued to emphasize that “onto the next” mentality that carried them to within two games of the Stanley Cup final last season.

“I think we recognize that you take each game as a singular event, and you move on, good, bad or indifferent,” Trotz said Monday. “You try to get better if you win or if you lose. Today it will be about, ‘Let’s get our bodies right, let’s get our minds in the right place for tomorrow.’

“We didn’t do anything, we won one hockey game.”

As electrifying as taking a series lead in overtime on the road must’ve been, the Isles are well aware it was a back-and-forth contest that could’ve gone either way. Trotz lauded Penguins coach Mike Sullivan for what he’s accomplished this season, adding that he expects Pittsburgh to come out Tuesday night with noticeable adjustments — ones the Islanders will have to anticipate.

“This is where the chess match comes in a little bit,” Trotz said.

But the Islanders always talk about how they need to control what they can control, and one of those things is their mindset. Since last season’s playoff run, the team has preached the need to take each game as it comes.

“It’s a race to four and we did a good job picking up the first game,” winger Matt Martin said. “Now, our goal is to make it a 2-0 series. We know it’s going to be tough, they’re a good hockey team. They’ll play a desperate game [Tuesday night], and we just need to be at our best and be better for what’s ahead.”

There will certainly be new challenges for the Islanders in Game 2. Not only will they be facing a Penguins squad with an overwhelming sense of urgency, but there is a possibility of lineup changes. Additionally, PPG Paints Arena will be at double the capacity it was for Game 1, increasing to 50 percent.

After second-line center Evgeni Malkin sat out of the series opener with an undisclosed injury, Sullivan labeled him a game-time decision for Tuesday. Malkin missed 23 games from March 16 to May 3 with a knee injury, but returned to the Penguins lineup for the final four regular-season games.

Even if Malkin isn’t ready for Tuesday’s rematch, the Islanders are expecting him to get into a game at some point.

“He’s a game-changer,” Trotz said. “Will that do anything for us? No, we’ve got to play the same way that we play [Sidney Crosby] or [Jeff] Carter or Malkin. Our concept is a very team concept and it won’t really change much. You just know that he has certain unique qualities as a player that are going to make them better.”