However, the part of his career that stands out is the corruption scandal in the Torino–Juventus derby in 1927 that resulted in Torino being stripped of their title.

According to the official account, a manager from Torino offered Allemandi 35 000 lira to throw the game, 25 000 immediately and the rest after the match.

After a controversial trial, along with Torino's title revocation, Allemandi was banned for life even though he always self-proclaimed innocent.

After debuting for the Italy national team in 1925, Allemandi eventually won the left back position from Umberto Caligaris before their 1934 World Cup qualifying match against Greece.

Manager Vittorio Pozzo started him in every match of the final tournament, helping the Azzurri win the title on home soil; he later served as Italy's captain between 1935 and 1936.