Monnier appeared at three ISU Champions Series/Grand Prix events – the 1997 Skate America (11th), 2000 Skate Canada International (12th), and 2000 Trophée Lalique (7th). He placed 15th (8th in his qualifying group, 15th in the next two segments) at his first senior ISU Championship – the 2000 Europeans in Vienna, Austria. In his final competitive season, 2001–02, he won the French national title and placed 10th at the 2002 Europeans in Lausanne (5th in his qualifying group, 11th in the short, 9th in the free skate).