[3] Born in Muzzana del Turgnano,[4] Frossi began his career as a professional footballer with Udinese, and, after a long stay in Serie B (with Padova, Bari, and L’Aquila), he was acquired by Ambrosiana Inter, where he made his debut on 21 June 1936, in Mitropa Cup.

According to Gianni Brera, he was known in particular for his pace, energy, and coordination; he was not the most technically gifted footballer, however, and was also not particularly good in the air or acrobatically, as he needed to play with glasses due to his myopia.

[3] Shortly after hanging up his boots, Frossi became a coach, and became manager of a series of Italian clubs – Lumezzane[citation needed], Genoa, Napoli, Monza, Torino, Modena, Triestina, and also Internazionale, without however producing any outstanding results.

Despite an 11 match unbeaten record, Inter dispensed with his services because of dissatisfaction with his tactical style and it seemed that Ferrero had won the battle of ideas, together with influential players such as Enzo Bearzot.

In international terms, it is probably true that the advocates of a more balanced, attacking football have achieved more success, notably the all-conquering A.C. Milan team of the early 1990s, managed by Arrigo Sacchi, and the 1982 FIFA World Cup winners of Enzo Bearzot.

He later worked as a general manager for Alfa Romeo in the industrial sector, and then, in the last years of his life, he was a columnist for Italian newspaper Il Corriere della Sera in Milan.