 He would go on to play a somewhat important part in the team's four consecutive Ligue 1 titles (with the player's presence), and was also a regular selection for the France U-21 squad during that timeframe.In July 2007, l'OL agreed to transfer Berthod to AS Monaco FC for a fee of €2m.He made his Monaco debut in the season's second round, a 1–2 defeat at FC Lorient – picking up a yellow card in the process – and finished the season with 12 league contests played.