BERLIN (AFP) - A former business partner of German tennis star Boris Becker, who was last month declared bankrupt, is demanding the payment of €36.5 million (S$57.3 million) which he claims he is owned by the former world number one.

Swiss businessman Hans-Dieter Cleven claims he is owed 40 million Swiss francs (S$57.3 million) by Becker but did not reveal the origin of the sum.

"After the recent decision by a court in London to declare Boris Becker bankrupt was made public, the former business partner of Boris Becker, entrepreneur Hans-Dieter Cleven felt obliged to enforce his demands in light of that procedure," law firm GHM Partners acting for Cleven said in a statement.

Becker's lawyer Mr Christian-Oliver Moser told German news agency DPA, that Cleven was "lobbying in public" to win an "unfounded claim".

Becker - who won six Grand Slams in the 1980s and '90s; three Wimbledon, two Australian Open and one US Open title - has denied he is bankrupt and told the German press he can meet all his obligations. The 49-year-old is currently working as a television pundit during the Wimbledon championship in London.