Signs welcomed him back and No. 3 Islanders jerseys were pressed up against the glass during pregame warm-ups Sunday night at Barclays Center.

Travis Hamonic never got a real goodbye when he was traded to Calgary in June, but the crowd was on hand to say hello again.

The club’s former alternate captain — and homegrown defenseman of seven years — returned to his old home for the first time as the Islanders fell to the Flames 3-2.

“He played every shift like it was going to be his last and he’d do anything to try to win,” coach Doug Weight said before the game. “Block shots, fight, I think he was a real good adapter. … Definitely a big part of our team.”

The Islanders played a video tribute during the first TV timeout and Hamonic received a standing ovation from the crowd as he waved back in appreciation. He later fired a shot that led to the Flames’ winning goal.

“The video was really touching,” Hamonic said. “To get that ovation in warm-ups and during the video, and the respect the Islanders showed as well by all getting up, it meant a lot.”

Hamonic, who had requested a trade in the fall of 2015 to be closer to home in Manitoba for “a personal family matter” — though he told on Sunday morning he rescinded the request at the end of that season — registered 26 goals and 120 assists in 444 games with the Islanders.