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.
More top news
More than 550 people have been killed in flooding across northern India, Nepal and Bangladesh.
Showers in the north. Fine in the south
A British man was injured in a suspected terror attack in Finland in which two people were killed, the Government has said.