21-year-old, Louis, who once worked at the Doncaster Rovers club as a hospitality waiter, has been issued with the number 28 shirt for the 2013/14 season.
He has signed as a non-contract player in aid of Bluebell Wood Children's Hospice in Sheffield.
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The Democratic presidential candidate may also have shown his cards on his choice of running mate.
The US president also shared a post on Twitter accusing Dr Anthony Fauci of misleading the public over hydroxychloroquine.
Fears over an impending second wave of coronavirus dominates Wednesday’s front pages.