Selected in the second round (50th overall) of the 2017 NHL Draft, Comtois scored his first career goal just 49 second into his NHL debut on October 3 at San Jose. His goal was the fastest to start an NHL career since 1989, when Buffalo's Alexander Mogilny scored 20 seconds into the first on Oct. 5, 1989 vs. Quebec. The Longueuil, Quebec native scored in the following game on October 6 at Arizona to become the first Ducks player to score in his first two career NHL games.