He spent two full seasons with the Bergamo-based club, where he made 9 league appearances, including his Serie A debut.

Throughout his time with the club, he formed partnerships in midfield with the likes of Antonio Conte, Paulo Sousa, Didier Deschamps, Angelo Di Livio, Edgar Davids, Gianluca Zambrotta, Mauro Camoranesi, Pavel Nedvěd, Zinedine Zidane, and Enzo Maresca.

In July 2005, Tacchinardi was transferred to Villarreal CF who signed him on one-year loan from Juventus, following the appointment of Fabio Capello, who took over the managerial position from Marcello Lippi, and also due in part to the purchases of Patrick Vieira and Federico Balzaretti.

He became an integral part of the starting XI for the club, helping the team to reach the UEFA Champions League semi-finals.

Tacchinardi signed a two-year deal with Brescia Calcio on 9 August 2007, and was a key attribute to the Serie B club's first team, appearing in all but 8 league games, and scored 11 goals.

[4] Tacchinardi was not a regular player for the Squadra Azzurra, never playing in the final stages of a major tournament, in several cases due to injury, but also because this was a period of many high quality Italian international midfielders.

He was noted for his powerful and accurate long range shooting, as well as his striking ability from volleys, which saw him score several goals from distance during his time with Juventus.

A hard-working and tenacious player, with a strong mentality and a wide range of skills, he was predominantly known for his excellent positional sense, anticipation, and tactical intelligence, as well as his tackling ability, which made effective both offensively and defensively, and also allowed him to play as a centre-back on occasion in a zonal marking defensive system.