A few games later, star defenseman Shea Weber was activated from injury reserve and the Canadiens sacrificed veteran defenseman Karl Alzner before Kulak by putting him on waivers.[8] On December 29, 2018, Kulak scored his first goal for Montreal in a 5-6 defeat to the Tampa Bay Lightning.[9] He scored his first game-winning goal in a 3-0 victory over the Colorado Avalanche on January 12, 2019.[10]