The striker's deal with BVB carries two different exit clauses, says BILD.
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Guirassy can leave Dortmund for a set fee of €100m - thanks to the option in his deal.
However, should either Real Madrid or Barcelona come knocking, he can move to either Spanish giant for a knockdown €65m.
In Germany, it's been suggested Guirassy is being considered by Barca chief Deco as a replacement for veteran Robert Lewandowski, who is off contract in June.