"I come from a small town in Sweden, too, so it feels like home when I'm [in Buffalo]," Dahlin said. "I know everything about the fans, and I know so many great things about how they love hockey and the organization is amazing. I'm so looking forward to getting there.
"I heard so many great things about [the fans]; they love hockey in that city, and I can see that. When they come to me, they know me and I don't even play in the NHL, so they probably love hockey."
Dahlin had 20 points (seven goals, 13 assists), a plus-4 rating and 84 shots on goal in 41 games this season, when he averaged 19:02 of ice time. He had 23 points (eight goals, 15 assists) in 67 games for Frolunda, the most for an under-18 defenseman in the history of Sweden's top league.
He was named best defenseman at the 2018 IIHF World Junior Championship, when he had six points (all assists), 25 shots on goal and a plus-7 rating to help Sweden to a silver medal.
Sabres general manager Jason Botterill said he anticipates Dahlin will play in the NHL in 2018-19.
"It's a huge boost to us and what we're trying to accomplish, and we feel we have some very good young forwards in our organization right now, but we have to have more scoring from the defense," Botterill said. "You just look at how Rasmus has handled himself the last couple of years, playing in SHL and playing in the World Juniors, we feel he can step into the NHL next year and really add that offensive dimension to our back end."
Dahlin said he will try his best to make an impact in the NHL next season.
"I really hope so; I will try 100 percent to do that," he said.
Dahlin was the youngest player by seven years on Sweden's roster for the 2018 PyeongChang Olympics. He played two of the four games and had one assist and one shot on goal for fifth-place Sweden.
"I'm super excited to meet everyone on [Buffalo] and to try to get a spot on that team," Dahlin said. "That's my dream, to play in the NHL. I know a bunch of guys play on that team, and they are skilled guys. It's amazing to be part of that organization, and it's cool to play with those kind of guys."