Nzonzi, 35, signed his contract with Sepahan SC on Monday after he got the required approval and carried out medical tests.
He has previously played for Paris Saint-Germain F.C., Sevilla, AS Roma, Blackburn, Stoke City, and Galatasaray.
The midfielder was a member of France’s U-21 national team and also won the 2018 FIFA World Cup with France.
Sepahan SC came second in the 2022-2023 season of Iran’s premier league and will be present at the AFC Champions League (ACL) this year.