Boris Becker is believed to have borrowed £2 million from a British telecoms billionaire amid claims he may sell his Wimbledon trophies to help pay off an alleged £54 million debt.
The three-times Wimbledon champion was declared bankrupt in June.
Becker's costly divorce from his first wife, and a series of failed business ventures has seen his assets dwindle from £35 million to just €540,000, according to German magazine Stern.
The fall from grace led Becker to ask for a loan from John Caudwell, the co-founder of Phones 4U.
Mr Caudwell, whose daughter worked as a personal assistant in Becker's London office, agreed to loan him £2 million, with the interest rate set at 25 per cent.