Ku dhashay Milan, Castellazzi wuxuu ku qaatay xirfadiisa kooxeed oo dhan 1920s iyo 1930s isagoo u ciyaaray Ambrosiana-Inter ee Serie A. Wuxuu u ciyaaray 261 kulan dhammaan tartamada kooxda, isagoo dhaliyay 16 gool, isagoo ka caawiyay kooxda inay ku guuleysato 1929-30 Serie A
Horyaalka Ciyaartii ugu horeysay ee kooxdiisa waxay timid 6 Oktoobar 1929, guushii 2-1 ee Livorno.