A spokesman for Mr Caudwell told The Times the loan had been repaid, although later than agreed.
Becker's financial woes are said to have spiralled, with the six-time Grand Slam winner now owing £10.5 million to Arbuthnot Latham & Co, a private London bank.
He is also believed to owe €38.4 million to Hans-Dieter Cleven, his long-term business adviser.
It is understood that his total debts amount to more than £54.4 million, a figure "vehemently denied" by his lawyer, Christian-Oliver Moser.
Becker was said to be considering selling his Wimbledon trophies, which are kept at his £7 million London home.
His agent was unavailable when approached for comment on Thursday night.