One day after the Bruins received some good news on the injury front, Boston learned one of its top young players could miss the next three months.

Forward Frank Vatrano will undergo surgery Monday to repair torn ligaments in his left leg, Bruins general manager Don Sweeney announced Saturday. Sweeney said the injury occurred while Vatrano was training, and his recovery is expected to last three months.

“Well, obviously, it’s a blow,” Sweeney told reporters, via “Frankie looks at his opportunity, we all did — how that was going to play out remains to be seen. But he certainly was going to be put in a position to try and grab a hold of it, so he’s disappointed, and we are as well.

“You look at it as all injuries are: as a setback. But doctors feel very good that three months from now, he’ll be returning to play and hopefully moving forward.”

Vatrano, 22, had eight goals and three assists in 39 games for the Bruins last season, and he also led the American Hockey League in goals.

— provided the offensive lines and defensive pairings for the second day of camp, which you can see below.

Group B
Danton Heinen — David Krejci — Zach Senyshyn
Jake DeBrusk — Austin Czarnik — Jimmy Hayes
Colton Hargrove — Noel Acciari — Seth Griffith
Anton Blidh /A.J. White — Sean Kuraly — Tyler Randell

Jakub Zboril — Kevan Miller
Tommy Cross — Colin Miller
Jeremy Lauzon — Rob O’Gara
Linus Arnesson — Alex Grant

Malcolm Subban, Dan Vladar

Group A
Matt Beleskey — Ryan Spooner — Peter Mueller
Peter Cehlarik — Dominic Moore — Riley Nash
Jesse Gabrielle — Tim Schaller — Brian Ferlin
Mark Naclerio — Colby Cave — Justin Hickman

Matt Grzelcyk — Adam McQuaid
John-Michael Liles — Brandon Carlo
Joe Morrow — Chris Casto
Alex Roach — Torey Krug

Anton Khudobin, Zane McIntyre

— Day 3 of training camp is scheduled to get underway with Group B at 10:45 a.m., with Group A following at 12:45 p.m. at Warrior Ice Arena in Boston.

Thumbnail photo via Bob DeChiara/USA TODAY Sports Images