Rubuta ci gaba don wannan sakin layi - Gillies ya buga wasan hockey na kwaleji tare da Providence Friars a taron NCAA Men's Division I Hockey East. A cikin shekararsa ta farko, an ba Gillies kyauta ta wasa mai ban mamaki tare da zaɓi zuwa 2012 <unk> 13 All-Hockey East First Team. Shi ne mai tsaron gida na farko ga Amurka a gasar 2014 ta Duniya
kuma ya buga kusan kowane minti na gasar, amma ya kasa lashe lambar yabo. A lokacin karaminsa, Gillies ya jagoranci Friars zuwa taken NCAA, wanda aka zaba a matsayin Frozen Four Mafi kyawun Player.