According to BBC Sport, the Red Devils included additional payment clauses dependent on appearances and achievements at Dortmund, meaning they could receive €4 million (£3.4m/$4.3m) in bonus payments. The report adds as the 24-year-old has featured in the majority of Dortmund's games since joining them on loan in January, it is thought they could receive all of that £3.4m.
DID YOU KNOW?
Sancho scored just 12 goals and bagged a paltry six assists in 82 games for United. Since returning to former side Dortmund, the former Manchester City academy product has scored three times and turned provider twice in 18 appearances - 16 of which have been starts - for BVB.
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WHAT NEXT?
Sancho, whose contracted to Old Trafford until 2026, will play in his first Champions League final - and Dortmund's third - on June 1 at Wembley, with Real Madrid or Bayern Munich battling it out to be their opponent.