Kammala jumla mai zuwa: Wani dan asalin Quebec, Gauthier ya ci gaba a cikin shirye-shiryen wasan hockey na kankara na gida kuma ya yi niyyar bin aikin koleji maimakon QMJHL. Bayan da Océanic ya zaɓe shi a QMJHL da Youngstown Phantoms a United States Hockey League, Sidney Crosby ya ƙarfafa shi ya bi aiki a lardinsa. A lokacin da yake aiki tare da kungiyar, Gauthier ya yi gasa ga Team Canada a wasannin kasa da kasa daban-daban. Ya lashe lambar zinare a 2013 IIHF World U18 Championships da kuma
2015 Gasar Hockey ta Duniya ta Junior.