The young midfielder is one of the hottest prospects in Europe and has attracted attention from around the continent.
I would like Mario to be with BVB until he is 35 years old. We’re counting on him through the years”, Borrusia Dortmund sporting director Michael Zorc told Bild.
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Chelsea have struggled to build momentum in the opening stages of the campaign and are currently looking over their shoulders at the relegation zone.
Who of Europe’s top strikers will move to England this summer?