Gauthier, a Laval, Quebec native was selected in the first round of the 2013 NHL Entry Draft. Dave Nonis was the general manager of the Toronto Maple Leafs at the time and he knew that he wanted a physical centre.
Last season, Gauthier split his time between the Toronto Marlies and the Toronto Maple Leafs. During his stay with the Marlies, he posted 6 goals, 12 assists and an 11.8 SH% in 56 games played.
In early January, Lou Lamoriello, former general manager decided to call up Gauthier. Mike Babcock featured Gauthier in 9 games and had him play fourth line minutes.