The Greece centre-back joined the German outfit on a season-long loan deal at the start of the campaign, with a view to a long-term switch. An obligation to buy was written into the contract but would only be active should Stuttgart avoid relegation from the Bundesliga.
With the side avoiding dropping into the second-tier courtesy of a dramatic final day victory over FC Koln - Waturo Endo scoring in the 92nd minute - the clause to make Mavropanos' switch to the Mercedes-Benz Arena became active.
The club announced the deal on their official website on Thursday afternoon with a short statement. It read: "As a result of staying in the class, Konstantinos Mavropanos' contractually agreed commitment comes into effect. The Greek national player, who was previously on loan from Arsenal FC, is now contractually bound to VfB until June 30th, 2025."
Meanwhile, the 24-year-old also gave his say on sealing a permanent move to Germany. He said: "I have always done my best and will continue to do my best for this great club. The trust of those responsible and the affection of the fans in Stuttgart are a great motivation for me."
It remains to be seen how much the Gunners have managed to earn from the sale of the Greek defender - but it appears unlikely to be a considerable amount. Reports from The Athletic have suggested that Stuttgart will fork out just £3m, whilst having the potential to pay up to £1.5m in bonuses.
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