After working his way through the club's youth ranks, he made his first team debut in the Italian Serie A on 23 October 1994 against Foggia.
After scoring seven goals in his second season with the club, Inter bought back the full registration rights to Zanchetta and sold him permanently to Chievo shortly after.
Zanchetta showed his talent in attack, scoring five goals in his second Serie A season, although Reggina was relegated.
With Chievo, which he was awarded a new contract until June 2007 in March 2004 (along with Salvatore Lanna),[3] he failed to become the regular starter, but worked as a good backup player, for the team that had Mario Santana, Luciano, Franco Semioli and Victor Obinna in attack.
Due to the 2006 Italian football scandal, Chievo qualified for the 2006–07 UEFA Champions League; he played both legs in an attacking midfielder role.