Born in Milan, Castellazzi spent his entire club career in the 1920s and 1930s playing for Ambrosiana-InterinSerie A. He played 261 match in all competitions for the team, scoring 16 goals, helping the club to win the 1929–30 Serie A championship.[1] His club debut came on 6 October 1929, in a 2–1 away win over Livorno.
With the Italy national team, Castellazzi made three appearances between 1929 and 1934; he made his international debut on 1 December 1929, in a 6–1 friendly home win over Portugal in Milan, and later appeared in a 4–2 friendly home win over Switzerland in Rome, on 9 February 1930. He also made one appearance – his final international cap – in the team's victorious 1934 FIFA World Cup campaign on home soil, starting in the first quarter-final against Spain, held in Florence, on 31 May, which ended in a 1–1 draw.[2]
After retiring from football at the age of 32, Castellazzi remained with the Ambrosiana-Inter organization where in 1938 he became the first person in the history of the first division to win the championship both as a player and as a coach.
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