Giustozzi started his career with Argentine side Lugano (Argentina), helping them win their only league title.
[2] In 2003, Giustozzi helped Argentina win the 2003 Copa América de Futsal, their first major trophy.
[3] In 2005, he signed for Spanish top flight club Segovia Futsal.
[5] In 2012, Giustozzi signed for Italian top flight team Real Rieti.
[7] In 2013, he was appointed manager of Italian outfit Real Rieti.