He played CIS football for the Laval Rouge et Or from 2012 to 2015 where he won two Vanier Cup championships in 2012 and 2013.

During the 2019 West Division Final against the Saskatchewan Roughriders, with the Blue Bombers leading 20–13 in the fourth quarter, Gauthier made a shoestring tackle to save a touchdown during a trick punt return.

Winnipeg closed out the game by the same score and the Blue Bombers advanced to the 107th Grey Cup.

[3] In the Grey Cup game that year, Gauthier recorded one special teams tackle as the Blue Bombers ended a 29-year championship drought in the victory over the Hamilton Tiger-Cats.

[4] On January 8, 2021, Gauthier signed a one-year contract extension to remain with the Blue Bombers.