After rising through the ranks of the academy, he was promoted to the club's first team for the 2006–07 season, and signed his first professional contract with the side. A technically blessed, ball-winning box-to-box midfielder, Chantôme made his debut for Paris Saint-Germain as a 75th-minute substitute against Lyon in the Trophée des Champions, which the club lost 5–4 in a penalty shootout following a 1–1 draw in 120 minutes of play. He made his league debut for the club as an 83rd-minute substitute in a 1–0 win against Valenciennes on 12 August 2006.
Chantôme's rise through the academy led to his promotion to the primary team for the 2006–07 season and signing of his first professional contract with the club. A technically adept, all-around midfielder who excelled in both defensive and offensive play, Chantôme entered the game as a substitute for Paris Saint-Germain against Lyon in the Trophée des Champions, which the club ultimately lost after a penalty shootout following a 1–1 draw. He made his league debut for the club by coming on as a substitute in a 1–0 victory over Valenciennes on August 12, 2006.