 In the summer of 1992 he transferred to Atalanta, making his Serie A debut with the club, and scoring 14 goals during his first season in the top division.He spent three seasons with the club, although Atalanta were relegated during his second season, and he passed his final season in Serie B.

Ganz transferred to Internazionale in 1995, spending two seasons with the club; Ganz scored 36 goals from 68 appearances for the club, and was a feared goalscorer, earning the nickname "he always scores!