Galchenyuk, fourth on the team with 10 goals and 23 points, will miss six weeks with a broken hand sustained during a game Jan. 6 against the Florida Panthers.
Bergevin, speaking during the Canadiens' optional morning skate Wednesday prior to their game at Wells Fargo Center against the Philadelphia Flyers (7:30 p.m. ET, TSN), said he will look at the current roster for someone to step into Galchenyuk's role before investigating any trades.
"We always look within first," Bergevin said. "A player like Alex you don't, unless you want to give up the house, the farm, to replace him, it's impossible. You look at Tampa Bay when they lost [Steven] Stamkos … he's not Stamkos but I'm just saying. [Phoenix Coyotes captain] Shane Doan went out for a while. You don't replace these players. You just give more guys ice time and they have to come through for you."