Mike Bossy was yet again in the bowels of Nassau Coliseum, shaking his head with something resembling disbelief as he thought about the first half of the Islanders season.

“I have to admit, this whole season is a little surreal,” Bossy said Thursday morning, before the Islanders’ 5-2 loss to the Bruins when he was next in line from the dynasty teams to be honored. “I don’t think anybody expected the team to be where they are today.”

That would holding a three-point lead atop the Metropolitan Division and in the race for the best record in the Eastern Conference. This is the final season for the franchise at the only home building they’ve known, that crumbling barn out in Uniondale where Bossy and his compatriots won four consecutive Stanley Cups.

With each win this season, the fans have become more engaged. And it has created a whirlwind of excitement — yet one that has this bitter aftertaste, knowing that come October, the team will be calling Brooklyn’s Barclays Center home.

“It’s kind of bittersweet for the fans that have been trekking here — the diehards, who have been trekking here for the last while and waiting for this moment to come,” Bossy said. “You never know. You’ve seen teams come from nowhere to win Stanley Cups, and it’s certainly a possibility with this team.”

There, he said it. The Hall of Famer and one of the great goal-scorers of all time said the Islanders have a chance to win the Stanley Cup. And he said “the reasons are simple” for why they’re in the position they are.

“You have a goalie that is stopping pucks, which is what you absolutely need to win hockey games,” Bossy said of Jaroslav Halak. “You have a defensive corps that can get the puck out of their own end. And — this is not said with any disrespect to previous teams that were here — but they seem to have found a chemistry. They seem to have found certain players that are getting the job done.

“It’s funny, since I’ve been back for the last eight years, the young guys that have come on to the team, you keep saying, ‘They’re young, they’re going to mature. They’re getting older.’ And it’s finally sunk in.”

Bossy said in his time playing for the Islanders, “We just took for granted that the place was going to be full and the crowd was going to be loud.”

That was not the case over the past decade or so, when the team was struggling and the amenities in the building were substandard, often leaving it half-full.

But now there is a connection with the fans that is unmistakable. The team has adopted the “Yes! Yes! Yes!” chant, and when they win, they gather at center ice and pump their arms in the arm just as the 16,170 do after every goal.

“That ‘Yes! Yes! Yes!’ chant, for starters, gets you really fired up,” said newly appointed alternate captain Cal Clutterbuck. “The fans have been really good here. Obviously, it’s an exciting time. It’s kind of bittersweet for them and for us, with us leaving the building. We’ve played well here, and I think they appreciate that. And we appreciate the support we’ve been getting. So I think it’s just a perfect storm.”

The confluence of events has made this the Islanders’ most memorable first half of a season since Bossy was running around making 50-goal seasons look commonplace. If it’s “surreal” now, imagine what it will be like if the Islanders make a postseason run.

“You know, when I came here, there was a lot of talk about rebuilding and doing things,” captain John Tavares said. “So it’s just bringing that year after year. It feels like everything is coming together. It makes it special because it’s the last year [of the Coliseum]. And the way we’ve been playing, we’re feeding off of that kind of momentum a little bit.”

Clutterbuck was fined $2,000 on Wednesday for his second “embellishment” offense of the season. It came from the 7-4 win over the Flyers on Jan. 19, when he was hooked by Jakub Vorachek, who was penalized on the play while Clutterbuck was not called for a dive.

“Kind of caught me by surprise,” Clutterbuck said of the fine. “Not really sure what else to say. When I get hooked in the slot when I have scoring chance, I guess I’ll try to react differently.”

Defenseman Lubomir Visnovsky (upper body) remained out the lineup, even though he took the morning skate and said afterward, “I’m ready.” Visnovsky, 38, will now have missed nine straight games.

“I’m sure he’s close, and I’m sure he’s itching to get back in,” coach Jack Capuano said. “But right now, for our staff, we’re going to go back to the same six defensemen. They’ve been playing real well, just day-by-day make that decision.”