Poehling suffered an upper-body injury in Philadelphia on Sunday and is expected to miss an extended period of time. Mathieu Perreault will likely draw into the Canadiens lineup to replace Poehling on Tuesday.
Helleson was a fourth-round pick in 2019 and is coming off of a great season at Boston College, scoring four goals with 21 assists (25 points) in 32 games.
Mrazek allowed five goals on 31 shots in the Maple Leafs loss to the Sabres last Wednesday. Jack Campbell struggled again on Saturday, so the Maple Leafs will come back to Mrazek on Monday. In his last six appearances, Mrazek is 3-3-0 with an .873 SV%.
