Brett Kulak will come out of the lineup for Petry, while Jon Merrill will return in place of Alexander Romanov.
Chandler Stephenson is not in the lineup for the Golden Knights for undisclosed reasons and has been replaced by Patrick Brown.
Petry injured his hand in Game 3 against the Winnipeg Jets and has been out of the lineup ever since. Merrill has been out of the lineup since Game 5 against the Toronto Maple Leafs due to an undisclosed injury.
Stephenson has six assists in 14 playoff games after setting a career-high with 14 goals and 35 assists during the regular season.
You can watch Game 2 between the Canadiens and Golden Knights on Sportsnet and SN Now. Coverage begins at 9 p.m. ET/ 6 p.m. PT.