Juventus is the club that has contributed the most players to the Italy national team in history.
[1] They are the only Italian club that has contributed players to every Italy national teams since its first appearance at the 2nd FIFA World Cup.
[2] Juventus have contributed numerous players to Italy's World Cup campaigns.
Source: (in Italian) [1] Archived 9 November 2011 at the Wayback Machine Legend: As of 11 July 2021.
(in Italian) National team in figures: the call-ups to all Italy national football teams (Major, Olympic and Under) by clubs (research in the FIGC official website)[permanent dead link]