In the latest twist to the massive corruption scandal engulfing world soccer's governing body, South Africa on Sunday denied a $10 million payment it made in 2008 was in any way a bribe to FIFA for the 2010 World Cup.

Two separate investigations are being carried out by American and Swiss authorities for alleged rampant and long-running corruption within FIFA, with several top officials arrested and accused by US investigators of taking tens of millions of dollars in bribes.

Several leading soccer officials have been questioned by Swiss investigators, and FIFA's president Sepp Blatter too could be quizzed "in the future if needed", according to Swiss prosecutors.