Barcelona join chase for big-name German star.
The German international has long been regarded as one of the best players in the world in his position, and is being tipped to leave Dortmund for a bigger club in the near future.
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Barca are one of his many admirers, and Fichajes.net claims they are looking at him again as they near the end of their FIFA-imposed transfer ban.
Still, the 26-year-old is sure to prove an expensive buy, with claims that he would now command a fee of around £50m after recently signing a new contract with his current club.