Giuseppe "Gipo" Viani (13 September 1909 – 6 January 1969) was an Italian football player and manager from the Province of Treviso who played as a midfielder.

He played his entire career in the Italian football system; he is best known for his time with Ambrosiana and Lazio.

[1] After retiring from playing, Viani went on to manage many Italian football clubs, including A.C. Milan, Roma and the Italy national team amongst others; he coached Italy at the 1960 Summer Olympics in Rome, alongside Nereo Rocco, helping the team to a fourth-place finish in the tournament.

Viani altered the English WM system – known as the sistema in Italy – by having his centre-half-back – known as the centromediano metodista or "metodista," in Italy – retreat into the defensive line to act as an additional defender and mark an opposing centre-forward, instead leaving his full-back (which, at the time, was similar to the modern centre-back role) free to function as what was essentially a precursor to the sweeper role, creating a 1–3–3–3 formation; he occasionally also used a defender in the centre-forward role, and wearing the number nine shirt, to track back and mark the opposing forwards, thus freeing up the full-backs form their marking duties.

Although this ultra-defensive strategy was initially criticised by members of the Italian press, including journalist Gianni Brera, Andrea Schianchi of La Gazzetta dello Sport notes that this modification was designed to help smaller teams in Italy, as the man–to–man system often put players directly against one another, favouring the larger and wealthier teams with stronger individual players.