Whakaotihia te rerenga e whai ake nei: Kua tohu a Morrissey i a Canada i roto i nga whakataetae a-ao maha, tae atu ki te IIHF World U18 Championships, te Ivan Hlinka Memorial Tournament me te IIHF World U20 Championships. I whai wāhi a Morrissey ki te āwhina i te kapa o raro i te 18 ki te wikitōria koura i te
2013 IIHF World U18 Championships, tae atu ki te kapa o raro i te 20 i te 2015 World Junior Ice Hockey Championship. I whakaingoatia ia ki te 2015 World Junior All-Star First Team, ka mutu me nga tohu e wha me te tohu +9 me te iti iho.