Mavropanos, 22, had spent the second half of the 2019/20 campaign on loan at Nuremberg since January where he played an instrumental role in saving the side from relegation in the Bundesliga 2.
The Greek Under-21 centre-back made 12 appearances and became a key figure for the German club.
The Arsenal defender has made eight first-team appearances for the Gunners since joining from Greek side PAS Giannina in January 2018.
Stuttgart earned automatic promotion to the German Bundesliga by finishing second in the same division.
Source: Naija News