Montembeault stopped 24 of 25 shots in Saturday's 4-1 win over the Senators.
Montembeault, who won his second straight start, has been stellar to open the season. He's allowed just one goal over 73 shots in wins over Toronto and Ottawa. The 27-year-old remains the team's primary netminder after taking over the role in 2023-24. The Canadiens host the Penguins on Monday.