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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Liverpool have unveiled their new home kit for next season, sticking with the hugely popular retro styling of the current shirt.
The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.