Kammala jumla mai zuwa: Morrisonn ya fara aikinsa na hockey tare da Ƙungiyar Ƙungiyar Ƙungiyar Vancouver Thunderbird (VTMHA). Bayan ya tabbatar da kansa a matakin al'umma, Kamloops Blazers na WHL ne ya zaɓe shi kuma daga baya aka zaɓe shi a zagaye na 1, na 19 na gaba ɗaya ta Boston Bruins a cikin
2001 NHL shigar da daftarin aiki. Daga baya aka ba shi zuwa Capitals a ranar 3 ga Maris, 2004 a cikin kasuwancin da ya aika Sergei Gonchar zuwa Bruins.