While foreign teams can buy Guirassy for 20m this summer, BVB and fellow Bundesliga clubs need only put down 18m to sign the centre-forward.
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In Swabia, those in charge are still hoping that Guirassy, who has a contract until 2026, will stay, given the club's qualification for the Champions League.
Guirassy has scored 28 goals in 29 games this season.