In 1934, Guarisi, as son of an Italian mother, had right of Italian citizenship and was selected for the 1934 World Cup squad, in the process becoming the first Brazilian-born player to win the World Cup. In the only qualification game that Italy had played (against Greece), Guarisi scored the first goal of "Azzurra" in a World Cup qualification game. In that match, he played with his colleague of Lazio, Fantoni II.