Fillol's debut in European football was in 1985 when he was traded to Atlético Madrid at 35. With Fillol as goalkeeper, the club won the Supercopa de España in 1985. In 1986 Fillol returned to Racing, where he won the first edition of the Supercopa Sudamericana in 1988, being also the first international title for the club after the 1967 Intercontinental Cup