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Published 10:23 12 Aug 2015 BST
Updated 12:02 12 Aug 2015 BST

Schalke have admitted that it would be difficult to turn down a huge fee, with the club's general manager Horst Heldt telling The Rheinischen Post: "If another club makes an astronomical offer for a player, for the good of the club you must always at least consider it.
"We want to keep him, but we can only definitively put the issue to bed on August 31. To say anything else would not be honest."Explore more on these topics: