German football federation president Wolfgang Niersbach has dismissed allegations of vote-buying to secure the 2006 World Cup.
Niersbach has told the DFB website in an interview that "I can absolutely and categorically rule out" the existence of such a fund from which FIFA executives were bribed, according to a report by Der Spiegel news magazine.
"I can assure that there was no slush fund at the DFB, the bid committee and the organising committee," he said, adding that there was "definitely not" any kind of vote-buying.
Niersbach was a vice-president of the German organising committee for the 2006 tournament and became DFB boss in 2012.
Another former organising committee vice-president, Fedor Radman, also denied the claims, telling Sky TV: "The bid committee never bribed anyone. I am ready to say this under oath. We bought no votes."
Der Spiegel said that the German bid committee had a slush fund of what is now the equivalent of 6.7 million euros ($A10.4 million) - provided by then Adidas chief executive Robert Louis-Dreyfus - which was used to buy votes from four Asian FIFA executives to secure the 2006 World Cup.
Germany won the FIFA vote 12-11 against South Africa.
The DFB said Friday it "categorically rejects the baseless allegations" but has also said that a payment of 6.7 million euros from the World Cup organising committee to FIFA in 2005 "may not have been used for its intended purpose."
However, it said the money was "in no way linked to the awarding of the 2006 World Cup."
Der Spiegel said the payment was disguised as money for a pre-tournament cultural event in Berlin which was later cancelled.
German Foreign Minister Frank-Walter Steinmeier, speaking in Tehran during a visit to Iran, urged the DFB to "to launch an investigation as soon as possible and clear up the open questions" because it is "in our common interest that nothing remains from it."
Niersbach said the DFB might sue Der Spiegel over the report.
FIFA said late on Friday it will investigate the "very serious allegations.
