Kammala jumla mai zuwa: An gayyaci dan wasa mai kyauta, Giroux zuwa sansanin horon Gatineau Olympiques don gwaji. Ba da daɗewa ba aka sa hannu. A lokacin da ya fara wasa tare da Olympiques, Giroux ya zira kwallaye 39 don jimlar maki 103 a wasanni 69 kuma an kira shi Quebec Major Junior Hockey League (QMJHL) Rookie na Shekara. Ya shiga cikin
2006 NHL Entry Draft kuma Philadelphia Flyers ta zaɓe shi a matsayin na 22. Flyers sun sanya hannu Giroux zuwa kwangilar shiga a ranar 23 ga Yuli, 2007.