Kammala jumla mai zuwa: Morrissey ya wakilci Kanada a wasannin kasa da kasa da dama, ciki har da IIHF World U18 Championships, Ivan Hlinka Memorial Tournament da IIHF World U20 Championships. Morrissey ya taimaka wajen taimakawa tawagar 'yan kasa da shekara 18 lashe zinare a gasar
2013 IIHF World U18 Championships, da kuma tawagar 'yan kasa da shekaru 20 a gasar cin kofin duniya ta hockey ta duniya ta 2015. An kira shi zuwa 2015 World Junior All-Star First Team, yana gamawa da maki hudu da darajar +9 da-kasa.