While Laine is the most significant addition, forward Kirby Dach's return from a season-ending knee injury sustained in Montreal's second game last season should provide a substantial boost to a top six that features the top line of Nick Suzuki, Cole Caufield and Juraj Slafkovsky, the No. 1 pick in the 2022 NHL Draft.
"It was a long year last year and I feel good health-wise," Dach said. "Body-wise it felt like I was ready to play games at the end of last year even if I wasn't really medically cleared to. I had a good summer and I'm just kind of coming into camp trying to almost re-prove myself or show that I can be an impact player on this team and hopefully help us win some games and get into meaningful games down the stretch."
Defensemen Jordan Harris (Columbus) and Johnathan Kovacevic (New Jersey Devils) were traded to help make room for potentially one of their top defenseman prospects, Lane Hutson, Logan Mailloux, David Reinbacher and Adam Engstrom.
Hutson, who played his first two NHL games last season, stood out during the Canadiens' two rookie tournament games against Toronto Maple Leafs prospects last weekend.
"He reminds me a lot of [Vancouver Canucks defenseman] Quinn Hughes," Suzuki said. "Just the way he skates, walks the blue line. Obviously Quinn's an amazing player and I'm sure Lane wants to be something like him. So it's impressive. He makes a lot of really nice plays, he sees the ice really well, so we'll see how he does at camp."
Hutson and Mailloux will be in the mix in what figures to be a tough competition for spots on a defense group that includes Mike Matheson, David Savard, Kaiden Guhle, Arber Xhekaj, Justin Barron and Jayden Struble.
"We have a lot of good young players," Canadiens executive vice president of hockey operations Jeff Gorton said. "We have a lot of players here so I think the competition for spots should be better now. We're increasing our talent pool."