In January 2019, he signed with San Marinese club Tre Fiori, where he won the Coppa Titano, before announcing his retirement in July.

At international level, he represented the Italy national football team on 17 occasions between 2004 and 2007, scoring one goal; he was a member of the Italian side that won the 2006 FIFA World Cup.

After a season spent in Germany at VfL Wolfsburg,[4] in which he helped the club to its first ever Bundesliga title, he rejoined Guidolin at Parma in August 2009.

[7] Towards the end of the 2014 summer transfer window, Milan had a deal in place with Parma in which him and Jonathan Biabiany would swap clubs, but the former refused the move.

On the expiration of his Milan contract in the summer of 2015, Zaccardo moved to recently promoted Serie A side Carpi on a free transfer.

[23] On 31 January 2019, Zaccardo announced on facebook that he had signed with San Marinese club Tre Fiori, but that he would be joining the team in March.

[25] Zaccardo represented the Italy under-16 squad (equivalent to the current under-17 team) at the age of 15, also taking part in the 1998 UEFA European Under-16 Championship held in Scotland.

[29] Due to his mistake during the World Cup, he was often overlooked by the national team since the tournament's conclusion, and only made two more appearances under Roberto Donadoni.

[33] A quick, tactically versatile, and hard-working right-footed footballer, in his prime, Zaccardo was known in particular for his stamina, professionalism, and positional sense as a footballer, as well as his intelligence, versatility, and his strong mental and physical characteristics, which enabled him to play in several positions in defence and midfield along the right flank throughout his career, despite not being the most accurate crosser of the ball.

As he has lost his pace with age in his later career, he has usually been deployed as a centre-back, in both a three or four-man defence, due to his anticipation and ability in the air.