Landreau was part of the France squad that won the 2001 FIFA Confederations Cup in South Korea and Japan. He made his debut in his only appearance of the tournament, a 4–0 win over Mexico in the final group game on 3 June. He did not play again until the 2003 edition that the team won again on home soil, taking part in a 5–0 win over New Zealand at the exact same stage at the Stade de France.