The German side are the only European club the former president of the United States follows on Twitter, prompting them to try to lure him for a visit
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After leaving office as president of the United States, Barack Obama must work out what to do with life after retirement.
George Washington ended his tenure in charge of the country and decided to start making whisky, George W. Bush found himself dedicating time to painting world leaders and... dogs, while his father is known for skydiving.
But as many Americans worry about what will become of his legacy and indeed the country under president Donald Trump, Obama has an excuse to leave it all behind and focus on something completely different.