Born in Milan, Campatelli debuted in Serie A at 17 years of age and played for Inter twelve seasons; in his early years he played a wing inclined towards goal then moved to midfield and later to defense. At twenty years of age he had already won a championship and had been called up to the national team by Pozzo to replace Serantoni in midfield. In 1940 he won his second title with Inter becoming the pillar of midfield yet never losing his great striking ability. A stylish player with fine ball skills he played a few internationals before being called up to the 1950 World Cup squad. He wore the number 10 jersey in the game against Sweden which was hist last game for the 'Azzurri'. After the World Cup he went to Bologna where two years later he closed a brilliant career to become a coach. In his last two years at Inter he became the idol of a defender from Friuli, Enzo Bearzot, who later became the coach of the Italian team that won the 1982 World Cup.