An Argentina international for eight years, Cavallero played with his country in two World Cups and the 2004 Copa América.

During his professional career he played for Club Atlético Vélez Sarsfield – being second-choice to Paraguayan José Luis Chilavert for most of his tenure[2]– Unión de Santa Fe, RCD Espanyol,[3] RC Celta de Vigo and Levante UD (the last three in Spain's La Liga).

With the last club, he also competed in the Segunda División, appearing in 38 games out of a possible 42 in the 2005–06 season as it returned to the top flight.

[4][5] In his four-year spell with Celta, Cavallero won the Ricardo Zamora Trophy in 2002–03 as the Galician team qualified for the UEFA Champions League having finished fourth.

[8] Cavallero won 26 caps for Argentina in an eight-year span,[9] and was a participant at the 1996 Summer Olympics, helping the national team win silver,[10] and the 1998 and the 2002 FIFA World Cups, starting in the latter ahead of Roberto Bonano and Germán Burgos.