Tulis hiji continuation for this paragraph - Morrissey geus digambarkeun Kanada di sababaraha turnamén International, kaasup IIHF Dunya U18 Championships, Ivan Hlinka Memorial Turnamén jeung IIHF Dunya U20 Championships. Morrissey berperan penting dina ngabantosan tim U-18 meunang emas di 2013 IIHF World U18 Championships
, ogé tim U-20 di 2015 World Junior Ice Hockey Championship. Manéhna ngaranna ka 2015 World Junior All-Star Tim Kahiji, réngsé jeung opat titik jeung +9 tambah-kirang rating.