Soon news about his qualities spread and attracted attention from the two main volleyball clubs of Italy of the period: Panini Modena and Santal/Maxicono Parma.

His career with the Azzurri colours ended in 2005 after a total of 474 caps (record), making him one of the most renowned players in Italy and the world for his excellent technical and jumping capabilities.

After having quit the national team, Giani played for Cimone Modena until 2008 and won two CEV Champions League.

In October, Slovenia unexpectedly won their first medal in a major volleyball tournament after reaching the final of the 2015 European Championship, where they were defeated by France.

In 2017, Giani replaced Vital Heynen as head coach of the Germany men's national volleyball team.