It is a shrewd piece of business for Die Schwarzgelben, with the sum of €105 million plus bonuses worth 40 per cent of the fee approximately ten times the amount Dortmund paid to bring the now 20-year-old to the Bundesliga from Ligue 1 side Rennes in summer 2016.
Dembele went on to have an outstanding debut campaign in Germany, scoring six league goals and providing a further 12 assists.
Watch: Ousmane Dembele’s assists in the 2016/17 season
The season culminated in Dembele helping Dortmund lift the DFB Cup in May, the first major trophy of his professional career, with the seven-time France international scoring the opener in a 2-1 win over Eintracht Frankfurt.
While Dembele's departure is a blow for coach Peter Bosz's side, Dortmund still boast an embarrassment of attacking riches, with Christian Pulisic, Marco Reus, Mario Götze, Andre Schürrle, Shinji Kagawa and Maximilian Philipp forming an all-star supporting cast for 2016/17 Bundesliga top scorer Pierre-Emerick Aubameyang.
@Dembouz félicitation mon frero fait moi rêver!!! oublie pas de me garder un abonnement 😆😂😂🙏🏽❤️— Aubameyang P-E (@Aubameyang7) 25 August 2017
*@Dembouz congratulations bro, show us what you've got!!! Don't forget to keep a match ticket for me