Laliberté started his playing career after being drafted 3rd overall in the Quebec Major Junior Hockey League (QMJHL) Entry Draft by the Montreal Rocket. He quickly became a top player for the team as one of their best offensive forecheckers. After just two years with the Rocket, who relocated to Charlottetown, Prince Edward Island during his time with the club, he was drafted in the fourth round, 124th overall, by the Philadelphia Flyers in the 2004 NHL Entry Draft.