The former Everton junior is currently with Germany's World Cup squad.
"Being here is an extraordinary experience and I am looking to take all I can from it for my career," Mustafi said. "You can go to Ibiza every year but you can only go to a World Cup every four!
"I don't know what will happen, we'll see after the World Cup finishes. I want to concentrate on the World Cup at the moment."
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