Lab director Martial Saugy called a news conference Friday to answer accusations by Tygart that he provided Armstrong with information on how to avoid detection for use of the blood-boosting drug EPO.

Tygart told the U.S. television program "60 Minutes Sports" on Wednesday that Saugy acknowledged to him that he gave Armstrong and his team manager, Johan Bruyneel, "the keys to beating EPO tests" before the 2002 Tour de France.

"The answer is clear: It's 'No,' " Saugy said Friday, adding he was "surprised" by the claim. "I would like to ask him (Tygart), really personally, why did he say that, because personally it was not the case."

Saugy suggested that Tygart had "deficiencies" in his recollection of their discussion in Moscow in 2010 soon after U.S. federal investigators opened a probe into Armstrong and doping in cycling.

"I don't really understand the interpretation on that part of the discussion," Saugy later said in an interview. "For me, it is a nonsense."

In the TV program, Tygart said he asked Saugy: "Did you give Lance Armstrong and Johan Bruyneel the keys to beating EPO tests?"

"And he nodded to say `Yes," Tygart said. "He explained to them, just the two of them. As far as I know, it's unprecedented. It's completely wrong to meet an athlete with a suspect result and explain to him how the test works."

Saugy acknowledged his respect for Tygart, with whom he worked on a previous case involving Armstrong's former teammate Tyler Hamilton. Tygart's determination to build a case against Armstrong for using EPO and other performance-enhancing drugs was crucial after the federal case was dropped early last year.

Armstrong was stripped of his seven Tour de France titles and banned from the sport for life after USADA released a report last year detailing widespread doping by the American rider and his teams.

"Travis Tygart is a key person in the fight against doping," Saugy said. "He knows the rules. He knows we must be transparent in order to respect the right of the defense. We need also to respect all the other athletes."

Saugy said he followed the International Cycling Union's request to meet with Armstrong in Luxembourg before the 2002 Tour started.

The Swiss official denied suggestions he had made an error or was naive in meeting the rider to discuss anti-doping strategy -- a decision now being criticized by Tygart and World Anti-Doping Agency officials as a clear conflict of interest.

"I have absolutely no regret. I would repeat it," Saugy said in an interview, explaining that Armstrong and other riders at that time had a right to information about false positive results in the relatively new EPO test. "They wanted to know what is the basis of the fight against doping."

He denied that meeting Armstrong was connected to the Texan's sample with suspicious levels of EPO taken at the 2001 Tour of Switzerland.

"For us, it was a closed affair," said Saugy, insisting that the EPO test was the sole reason. "No. 1 in the peloton is very influential, so we need to meet him to explain that we are not doing a bad job."

The UCI has said other riders and teams were given the same information from Saugy's lab in 2002 that Armstrong and Bruyneel received.

"This was clearly part of my job," Saugy said. "I do not interpret or understand the way I was producing this information as a key to escape from doping controls."

Saugy dismissed a suggestion that the dispute hinted at a rift with Tygart over how his lab, which manages the UCI's biological passport program, worked with USADA on the Armstrong case.

"I don't know what is behind it," Saugy said and added "Of course, (there) was some discussion between USADA and our laboratory because we were one of the laboratories working for UCI analyzing some of the samples, but no real difficulty."

Armstrong will give his first television interview since the sanctions were imposed when he speaks with Oprah Winfrey on Thursday.