The Islanders' Marshall Warren, right, celebrates a goal scored by...

The Islanders' Marshall Warren, right, celebrates a goal scored by Maxim Tsyplakov with Emil Heineman, center and Tony DeAngelo during the third period of an NHL game Saturday in Philadelphia. Credit: AP/Derik Hamilton

PHILADELPHIA — Marshall Warren’s trust in himself is a quiet confidence without a hint of cockiness. But the Laurel Hollow product has no doubt he belongs in the NHL.

The 24-year-old defenseman backed his belief with two assists in his NHL debut as the Islanders lost a 4-3 shootout to the Flyers on Saturday afternoon at Xfinity Mobile Arena.

“I’m just doing my thing,” Warren told Newsday. “It took a while to get here, but I know I belong and I feel like I’ve gotten overlooked a little bit. But I said when I get my chance, I’ll make it meaningful. I think I did that job today.”

Warren, skating on the third pair with Tony DeAngelo after being recalled from the Islanders’ AHL affiliate in Bridgeport on Thursday, logged 11:20 with two hits, two giveaways and one takeaway to go with his two assists.

Technically, he became the third native Long Islander to play a game for the Islanders after Port Jefferson’s Chris Ferraro (1999-2000) and Smithtown’s Kyle Palmieri (2021-present). Richie Hansen (1977-79) grew up in Northport after being born in the Bronx.

Warren grew up an Islanders fan and was a sixth-round pick of the Wild in 2019 who played four seasons of NCAA hockey for Boston College and one more for Michigan. He’s in his second full season in the Islanders’ organization.

Warren became the third Islanders rookie to score in his debut this season after No. 1 overall pick Matthew Schaefer and Russian free agent Max Shabanov.

“It’s very important,” coach Patrick Roy said. “We’ve got good young guys and we certainly want to see them play. I just feel we have a really good mix. Good veterans, good young guys and I love to see young guys play, maybe because I was in junior [hockey] for a long time [as an owner, general manager and coach]. I think they deserve the chance to show what they can do.”

Warren, retrieving the puck into the left circle, found Anthony Duclair at the right post for a 2-0 lead at 6:15 of the second period. Max Tsyplakov tipped Warren’s blue-line blast for a 3-2 lead at 4:21 of the third period.

“I thought I scored,” Warren said. “I cellied [celebrated] a little too hard. But it was cool.”

He took the traditional rookie lap stylishly without a helmet and stepped on the ice for his first shift at 1:13 of the first period.

Warren managed to keep his emotions in check.

“Just keep it simple and let everything come to you,” he said. “I’ve got the tools. Once my game comes, I’ll probably surprise a lot of people.”

Warren estimated he had 30 family and friends attend his debut, including his mother and sister. His father was tending to Warren’s grandfather, who is in the hospital.

“I can’t wait to call [my father],” Warren said. “He’s my best friend.”

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