VfB Stuttgart are set for a tidy windfall from Bernd Leno's move to Arsenal.
The Germany goalkeeper signed for the Gunners yesterday from Bayer Leverkusen, which he joined in 2012 from VfB.
Stuttgarter Nachrichten says part of the original sale included a sell-on clause.
Leno moved to Arsenal for €25m with 10 per cent due VfB, so earning them a cool €2.5m. Stuttgart originally sold him for €7.5m.