The Montreal native spent the past eight seasons working as an assistant coach, including last season with the New York Rangers, who advanced to the Stanley Cup Final. Lacroix spent three seasons on the Tampa Bay Lightning coaching staff, was with Montreal's American Hockey League affiliate in Hamilton in 2009-10, and coached three seasons with the New York Islanders.
He will be located behind the bench during games after working from the press box for New York.
"To have a chance to join a team like this and a staff like this is great," Lacroix told the Canadiens website. "It’s just a step up. It’s an opportunity to work for a great organization and an opportunity to work with great people. It's an opportunity to get back behind the bench, get closer to the action and have a bigger role on a day-to-day basis."