Dee ihe na-aga n'ihu maka paragraf a - E wepụtara ya na Quebec Major Junior Hockey League (QMJHL) nke 22 n'ozuzu ya na 1998
, Gagné na-egwuri egwu na-eto eto na Beauport Harfangs na Quebec Remparts maka oge atọ. Ọ malitere ọrụ NHL ya na Flyers na 1999 ma kpọọ aha ya na NHL All-Rookie Team. Ọ pụtara na NHL All-Star Games abụọ ma merie Bobby Clarke Trophies abụọ na Flyers dị ka MVP otu.