 He spent two seasons on the club's reserve team before joining AC Ajaccio on loan for two years.Squillaci returned to Monaco in 2002 and contributed to the team that won the Coupe de la Ligue in 2003.He also featured in European competition for the first time in his career and, in the 2003–04 season, played on the Monaco team that reached the 2004 UEFA Champions League Final.