He subsequently signed with Dax and played there from 2000 to 2001. He did not play in any internationals in 2000 or in 2001, but was an unused bench replacement during two tests against the Springboks. Mignoni found himself at another one of his former clubs the following season, signing with Béziers. During 2002 he played for France during the 2002 Six Nations Championship, which France eventually completed a grandslam of (winning all five matches). He signed with ASM Clermont Auvergne, then known as AS Montferrand, in 2003 and spent six seasons there. He was included in France's squad for the 2006 June tests against Romania and the Springboks. He was picked for the 2007 Rugby World Cup squad.