 In 1995, he was a main part of the Argentina under-20 team that won the FIFA World Cup in Qatar.Biagini signed for Atlético Madrid at just 18, being an important attacking element as the capital club won the double in his first year.He was mainly and regularly used as a substitute for compatriot Juan Esnáider and Kiko during his spell and, after a poor second season, moved to fellow league side CP Mérida in the summer of 1997, where he would be eventually relegated.