Forrest akatamba paFIFA U-20 World Cup muna 1987 uye akaita mutambo wake wekutanga kuchikwata chevakuru cheCanada mumutambo wehushamwari waMay 1988 neChile. Akawana makapu makumi mashanu nematanhatu (kusasanganisa mutambo waMay 1990 North American Championship wakanangana neUS), vazhinji vevamiriri vese munhoroondo yetimu yenyika yakabatana naPat Onstad uye vakawana machira akachena munhoroondo yenyika vasati vasiya nhabvu yepasi rose muna 2002. Chinhu chikuru pabasa rake renyika yose pasina mubvunzo kwaiva kubatsira Canada kukunda 2000 CONCACAF Gold Cup
, umo Forrest akatumidzwa zita remutambo MVP uye Most Valuable Goalkeeper yekubvumira zvinangwa zvitatu chete uye kumisa zvirango zviviri mumitambo yake mishanu. Uyewo panguva yebasa rake renyika yose Canada yakanga yakachengetedza 1<unk>1 kurova neBrazil mwedzi mumwe chete pamberi peNyika Cup muUnited States muna 1994. Forrest akaenderera mberi nekubudirira kurwisa Brazil muna 2001, achinyora pepa rakachena mukukwikwidza 0<unk>0 mu2001 Confederations Cup muJapan. Muna 2012, Forrest akasarudzwa nevateveri muCanada yakanakisa XI mumakore ekutanga zana eCSA.