Lewandowski left Dortmund for Bayern Munich before eventually joining Barca.
Asked if he will be supporting Real Madrid or BVB this weekend, he told Marca: "Yes, I'll be supporting them. I can imagine what it's like, because I played a final at Wembley with Dortmund. I remember how the atmosphere was...
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"For Reus it will be the last game, it might be his legacy. For Dortmund it's the second Champions League final and, although they face Real Madrid who are always Real Madrid, sometimes things that never happen, do happen.
"I have my fingers crossed for Dortmund, of course."