Seidenberg didn't play a game for the Islanders last season, but spent the year practicing with the team on a professional tryout, before inking a contract after the trade deadline. He didn't get any of the glamour of playing in the NHL last season, only the grind of tough practices. That spoke to Seidenberg's love for the game, his connection to the Isles and the organization's view of him as a mentor.
"It shows how much he loves the game, how much he cares and how much he cared about our team," Lee said. "For him to stick around and practice and do all those things and do everything that he'd normally be doing says a lot about his character."
The German defenseman played an integral role in Mathew Barzal's career, housing the Isles center during his rookie season and helping him adjust to life in the NHL. Seidenberg and his wife, Rebecca, are housing Noah Dobson, the Isles' prized defensive prospect, this season.
"He's like a mentor to me, just the way he handles himself and carries himself and trains," Barzal said. "You see the shape he's in. He's an ironman. He and that whole family have done a lot for me."
Instagram from @barzal97: Beth page.... seids wearin the extra small golf shirt lol 🏌🏽⛳️
READ: BARZAL LIVING AND LEARNING WITH SEIDENBERG
Boychuk seconded Seidenberg's reputation as a fitness freak, something that allowed Seidenberg to play into his late 30s.
"He's in better shape than maybe like 90% of the guys in the league," Boychuk said.
Seidenberg's last game came on May 15, 2018, as Germany lost 3-0 to Canada at the World Championships. Seidenberg was a longtime fixture on the German international team, representing Germany in three Olympic Games, and playing for Team Europe at the 2016 World Cup of Hockey. Seidenberg also won Best Defenseman at the 2017 World Championships.
In addition to his Stanley Cup in 2011, Seidenberg won a Calder Cup in 2005 with the Philadelphia Phantoms.
"He had a great career," Barzal said. "Obviously just such a pro off the ice at all times. I don't think there's a guy that worked harder… [I'm] happy for him, happy that he had a great career and he should proud of it."