With all the big absentees in front of the net, including Carey Price (injury), Jake Allen (COVID-19) and Cayden Primeau (COVID-19), it's Samuel Montembeault who will be Dominique Ducharme's go-to guy.
It hasn't been said, but from what we can tell, the Habs hasn't trusted Montembeault at all since he arrived in town. When Jake Allen was injured, shortly before he contracted the virus, it was Cayden Primeau who guarded the net, not the Quebecer, who, remember, was labeled as the second goalie. It's a rather nebulous situation.