Mezue ahịrịokwu na-esonụ: Morrissey anọchitewo anya Canada n'ọtụtụ asọmpi mba ụwa, gụnyere IIHF World U18 Championships, Ivan Hlinka Memorial Tournament na IIHF World U20 Championships. Morrissey nyere aka n'inyere ndị otu U18 aka inweta ọlaedo n'asọmpi
2013 IIHF World U18 Championships, yana ndị otu na-erubeghị afọ 20 na 2015 World Junior Ice Hockey Championship. A họpụtara ya na 2015 World Junior All-Star First Team, na-ejedebe na isi anọ na ọkwa +9 plus-minus.