BRIGHTON — Frank Vatrano and the Boston Bruins have been dealt a bad hand at the start of Training Camp.

Expected to compete for a spot on the Bruins’ top two lines, Vatrano’s sophomore campaign will be on hold.

“Obviously it’s a blow,” General Manager Don Sweeney said after Day 2 of Training Camp on Saturday.  Frankie looked at it as an opportunity as well did. How that was going to play out remained to be seen. But he certainly was certainly going to be put in position to try and grab a hold of it. Obviously, Frankie is disappointed, and we are as well.”

Vatrano, who will undergo surgery at Mass. General Hospital on Monday — the night the Bruins host the Blue Jackets in their preseason opener — is expected to miss three months.

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

The East Longmeadow native, who spent time between Boston and Providence last year and notched 36 goals in 36 games with the AHL club, tore ligaments in his left foot during training. In 39 games with Boston, the former UMass-Amherst product tallied 11 points on eight goals and three assists.

As tough as it is for the Bruins to lose Vatrano, another opportunity arises for players competing for a roster spot. The notables include prospects like Jake DeBrusk, Danton Heinen and Zach Senyshyn — both skated with David Krejci during the first session — and camp invitee Peter Mueller, to name a few.