Hummels reportedly told his father Herman “Either I go to Barcelona or I stay,” according to the Spanish paper El Mundo Deportivo.
It would be a huge blow to Dortmund to lose him, given that they are already set to lose Mario Gotze and Robert Lewandowsi this summer.
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Summer 2016 is set to be a very exciting time for football fans, as this is when the long awaited Euro 2016 tournament kicks off.
Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.