"He's got energy, he competes every shift," Bergevin said. "There were times last year where he had a tough time, I admit it. We watched him and there were nights we were wondering. But I think the package, what's underneath that rock, I think there's a lot more there. The fact there's a change of address, he comes to a place where he wants to be, I believe he'll thrive in this market."
Galchenyuk, 24, was selected by Montreal in the first round (No. 3) of the 2012 NHL Draft, Bergevin's first pick as Canadiens GM.
"I believe we did everything to help Alex," Bergevin said. "I believe he has produced, his career's not a failure. Players do move, he's not going to be the first guy that does that."
The Canadiens have the No. 3 pick in the first round of the 2018 NHL Draft in Dallas on Friday.
"To me it's a fun time of year," Bergevin said. "It's busy, sleep is going to be hard to get next week, but that's what we drive for. I'm looking forward to the draft."
Bergevin did not rule out the possibility of trading the pick.
"I'll listen, I'm open," he said. "I've told teams that if they want to make me an offer, I'll look at it. Sometimes teams don't want to move up as much as a team wants to move back or move up. If there's no takers or buyers, then we'll just sit back."
Asked if the Canadiens were holding contract discussions with forward Max Pacioretty, Bergevin said he would not discuss any negotiations. After refusing to confirm or deny reports that Pacioretty could be traded, Bergevin said, "I expect him to be back."