Lance Armstrong said Saturday he was losing no sleep despite the threat of a federal investigation into alleged doping practices casting a cloud over his stunning career.

Armstrong says he's not sweating the investigation. | Graham Watson photo

“It has no effect on my life ─ zero,” said the American, who will wind down his 20-year cycling career with the Tour Down Under this week.

So far, Armstrong has been “humbled” by the public support he has received in Adelaide, he said, as well as “amazed” by Australia’s reaction as the northeast of the country reels from the impact of deadly floods.

Armstrong overcame testicular cancer before winning a record seven consecutive yellow jerseys at the Tour de France. But he now faces potential disaster thanks to the doping probe.

Allegations leveled by former teammate Floyd Landis late last year helped ramp up a federal investigation into the misuse of funds by their then team, U.S. Postal, with whom Armstrong won six of his seven yellow jerseys.

Landis, who in 2006 was stripped of his own yellow jersey triumph following a positive test on the race, admitted doping and claimed he witnessed Armstrong using and in possession of banned substances.

Since then a grand jury probing doping in professional cycling has heard from several teammates and associates of Armstrong over several months, although no charges have been forthcoming.

Armstrong, who has often faced accusations of doping, said the investigation would not cause him to lose any sleep.

“I’ve got five kids to raise, a foundation to lead and a sport in which I still participate and I still love,” said Armstrong.

He is scheduled to compete for his RadioShack team in other, as yet unnamed multi-sport events this year.

Armstrong has faced claims of doping throughout his career, and even accusations of being given the protection of the sport’s international governing body, a claim which the UCI has flatly rejected.

Referring to his first Tour de France victory in 1999, he added: “I suppose 1999 was the start of it all, in terms of scrutiny. If you’re trying to hide something you’re not going to keep it hidden for 10 or 12 years.”

On what will be his last competitive visit to Australia, Armstrong admitted he had been impressed by the country’s collective bid to support the victims hit hard by floods in Queensland and New South Wales.

Reports of traffic jams on the way in to Queensland, as the country rallies to help those in trouble, left Armstrong in awe.

“I was amazed after hearing there were traffic jams on the way in to Queensland,” he added, comparing the situation to hurricane Katrina in the U.S. “There were no traffic jams when hurricane Katrina hit New Orleans.”

No ASO take-over

Armstrong also played down reports he had been preparing a takeover of Tour de France owner, Amaury Sports Organisation (ASO).

The RadioShack leader rejected suggestions he had ever harbored plans to launch an audacious takeover of the world’s biggest bike race.

Armstrong said Saturday it would be a “great idea” to take over the race, but admitted the move would probably not be welcomed by shareholders such as French media tycoon Arnaud Lagardere, or make much sound financial sense.

“It’s an expensive proposition. ASO is a family business with a few other shareholders, such as Lagardere,” said Armstrong. “He (Lagardere) has, to the best of my understanding, the first right of refusal on anything the family wants to sell. I think he’s interested in having a bigger stake in cycling.

“You have to consider that ASO owns a lot of properties, not just the Tour but other sporting events, a lot of media properties.”

Reports in the Australian media last year made allusions to Armstrong’s interest in buying the Tour de France. The reports raised eyebrows, especially as the 108-year-old race ─ one of the world’s top five sporting events ─ is regarded as an integral part of France’s national heritage.

But the American said: “There was never any serious discussions. That was the irony of the story.”