Armstrong ended his fight against doping charges in August 2012. In October, Usada released a 1,000-page report saying he had been at the heart of "the most sophisticated, professionalised and successful doping programme" ever seen in sport.

He was stripped of his titles by the International Cycling Union (UCI) shortly afterwards and given a lifetime ban from the sport.

Armstrong also resigned as chairman of the Livestrong foundation - the cancer charity he created - after the cycling body's decision.

His lawyer, Tim Herman, has described the Usada report as a "one-sided hatchet job" and the cyclist himself has accused the agency of offering "corrupt inducements" to other riders to speak out against him.

It is believed he is considering an admission because he wants to resume his athletic career, and has shown an interest in competing in triathlons.

Asked whether the 41-year-old was set to come clean（全盘招供）, Mr Herman told the New York Times: "Lance has to speak for himself on that".

Separately, the head of Usada told a US investigative programme that Armstrong offered the agency a donation of some $250,000 in 2004, reports said.

Speaking to 60 Minutes Sport, to be broadcast in the US on Wednesday, Travis Tygart said the offer was a "clear conflict of interest" and quickly rejected.

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