 Nyorai kuenderera mberi kweiyi ndima - Kassian akatanga nhabvu yepasi rose neHockey Canada pa2008 World U-17 Hockey Challenge, achikwikwidza kuTeam Ontario. Akanyora zvibodzwa zviviri nemapoinzi matanhatu mumitambo mitanhatu sezvo Ontario yakakunda menduru yegoridhe. Gore rakatevera, akaenderera mberi kusvika pasi pe-18 neCanada pa2009 IIHF World U18 Championships. Nezvibodzwa zviviri nemapoinzi mashanu mumitambo mitanhatu, akabatsira Canada kusvika kunzvimbo yechina. Makore maviri gare gare, Kassian akabatana nechikwata cheCanada chevaduku vari pasi pemakore 20 nokuda kwe2011 World Junior ChampionshipsmuBuffalo, New York. Munguva yemutambo, akagamuchira kumiswa kwemitambo miviri nekuda kwekurova kumudziviriri weCzech Petr Senkerik, achibata chirebvu chaSenkerik nebendekete rake. Kassian akadzokera kumakwikwi emenduru uye akabatsira Canada kumakwikwi emenduru yegoridhe, kwavakarasikirwa ne5-3 kuRussia. Akapedza mutambo wacho nechinangwa zviviri uye anobatsira pamusoro pemitambo mishanu. 