The Montreal native scored 187 goals in four junior seasons with the Quebec Major Junior Hockey League (QMJHL)'s Shawinigan Cataractes. He was also a two time selection to the league's first al-star team and made the second team once. He won the Jean Beliveau Trophy as the leading scorer in 1987-88. Lefebvre is still the all-time leading QMJHL scorer with 595 career points. In 2006 he became an Italian citizen by marriage and played for Italy in the 2007 World Championship.