Former FIFA vice-president Chung Mong-Joon has branded Sepp Blatter "a hypocrite and a liar".
Chung, who wants to succeed the outgoing Blatter as FIFA president, also said that he plans to sue him in court for embezzlement for being paid a secret salary.
Speaking at the Leaders Sport Business Summit in London, Chung said: "FIFA has become a badge of shame. To call it a mafia is almost insulting to mafia, so blatant and arrogant is its corruption.
"At FIFA money and power have blinded Blatter in the virtues of sportsmanship.
"For his payment without executive committee approval, I plan to sue Mr Blatter for embezzlement in court. Mr Blatter, in short, is a hypocrite and a liar."
Chung also claimed that it was a "travesty of justice" that Michel Platini was not investigated for voting that Qatar get the 2018 World Cup as his son landed a top job with a Qatari company.
He added: "Mr Platini voted for Qatar and his son landed a job a with a Qatar company as chief executive. The ethics committee did not even start an investigation, this is a travesty of justice."
Chung, along with UEFA president Platini, Prince Ali and Liberian FA president Musa Bility are confirmed candidates for the FIFA presidential election, due to be held on February 26 next year.
