The World Anti-Doping Agency (WADA) and the Union Cycliste International (UCI) have both issued statements regarding Floyd Landis' doping confession and his accusations against other riders.
WADA President John Fahey said: "WADA is aware of the serious allegations made by Mr. Landis. We are very interested in learning more about this matter and we will liaise with the United States Anti-Doping Agency (USADA) and any other authorities with appropriate jurisdiction to get to the heart of the issues raised. WADA looks forward to these further investigations and enquiries by those responsible.
"Generally speaking, WADA encourages everyone with knowledge of banned practices in sport, including athletes who were caught cheating and who denied the evidence for years, to be forthcoming in disclosing the information they may have to the proper authorities. This will further contribute to clean sport and strengthen existing anti-doping programs for the good of clean athletes worldwide."
UCI President Pat McQuaid told the Associated Press that Landis' allegations were "scandalous and mischievous."
"These guys coming out now with things like this from the past is only damaging the sport. If they've any love for the sport they wouldn't do it," he said.
The UCI statement said: "The International Cycling Union has learned of the declarations made by Mr. Floyd Landis and published in the Wall Street Journal.
"The UCI regrets that Mr. Landis has publicly accused individuals without allowing sufficient time for the relevant US authorities to investigate. An impartial investigation is a fundamental right, as Mr. Landis will understand having contested, for two years, the evidence of his breach of the Anti-Doping Rules in 2006.
"The UCI will leave it to the individuals accused by Mr. Landis to take the position they see fit with regards to this issue."
Subsequently, the UCI issued a second statement to defend itself against Landis' accusations of corruption.
"The International Cycling Union (UCI) categorically rejects accusations made by Mr Floyd Landis, in particular the allegation that a positive doping result by Lance Armstrong during the 2002 Tour of Switzerland was concealed after an agreement was reached between the American rider, his directeur sportif Mr Johan Bruyneel and the former UCI President, Mr Hein Verbruggen.
"Deeply shocked by the gravity of this statement, which considerably impinges on the honour of all persons who have dedicated themselves to the fight against doping, the UCI wishes to clearly state that it has never changed or concealed a positive test result.
"The accusation by Mr Floyd Landis, guilty himself of a breach of the Anti-Doping Rules in 2006, is thus completely unfounded and the UCI can only express its outrage at this new attempt to harm the image of cycling. Our sport has long paid a heavy price for the fraudulent behaviour of individuals such as Floyd Landis and we cannot accept the principles governing our work being challenged in terms of their ethics and honesty by a person who has not hesitated to breach such principles.
"By way of information, the UCI would like to point out that Lance Armstrong did not participate in the 2002 Tour of Switzerland.
"Finally, the UCI wishes to make clear that it will undertake all necessary measures to defend its honour as well as the honour of all its executives who have been unfairly accused by Mr Floyd Landis"