The 19-year-old Swede is now in the midst of his second training camp with the big club after being selected 21st overall in the 2021 NHL Entry Draft. As such, Lysell is feeling a tad more at ease this time around.
"I feel more comfortable. I mean, last year was kind of like the first experience, and everything was new, which was an unreal experience," said Lysell. "And I got a lot of energy from it this year. I've been here last year and now it's just more of like getting used to it.
"And maybe I can put even more energy out on the ice and try to like relax even more off the ice. So, I think last year definitely helped me coming into it."
Bergeron has noticed the difference - and the skill.
"Definitely a great talent with a lot of speed and a smart player. It's good to be on the ice with him and get to know him," said Bergeron. "I think that's what you want to see. From one camp to the next you want to gain some confidence coming back. You know what to expect and I'm sure that's happening for him.
"He had a great year in junior now he's trying to carry that over. He's a great player and I'm sure he's fighting for a spot. All the guys are pushing each other to be better."
During his first season in North America in 2021-22, Lysell's offensive game exploded over the second half of the year and into the playoffs. The winger finished with 62 points (22 goals, 40 assists) in 53 games and another 21 points (4 goals, 17 assists) in 12 postseason contests.
"I think it just came kind of natural," Lysell said when asked when he started to feel fully adjusted to the North American game. "I can't remember a certain moment, but I think after the winter break, kind of after World Juniors and all that - even though I got sick and [the tournament] got canceled - coming back the second time, I think that's kind of when everything started clicking maybe a little bit more. You get more used to the North American [game]. So, I would probably say around that time."
Though he's already made significant strides, Lysell knows there is plenty left for him to shore up if he expects to secure a spot with the big club in Boston.
"I think it's a lot of things if you want to reach that high of a level," Lysell said of his areas for improvement. "I think it's a lot of places like around the boards, getting the puck there and you got a D right up on you, using your body and your puck protection and all that to kind of separate yourself.
"Even though it's detail, it's a big part of the North American game, especially now playing with pro. So that's definitely an area I'm going to improve and try to improve a lot on. And then I would say just get the quick release faster as soon as you get the puck around the net; it's got to come off quick."