New York - Three-time Tour de France champion Greg LeMond has received a subpoena to testify before a grand jury in the investigation of possible fraud and doping charges against Lance Armstrong, the New York Daily News reported Friday.
The newspaper reported on its website that a grand jury in the US District Court of the Central District of California issued the subpoena, which requests testimony and documents related to the four cycling teams Armstrong has led - US Postal Service, Discovery Channel, Astana and RadioShack.
The letter also orders LeMond to appear at a federal courthouse in Los Angeles on July 30, the newspaper said.
The New York Times reported on Tuesday that US authorities had issued grand jury subpoenas to witnesses, citing unnamed sources "briefed on the case."
According to the Times, the subpoenas demonstrate how seriously authorities are taking allegations made by US cyclist Floyd Landis, who has said that doping was endemic in the US Postal team in the early 2000s, when he competed on it with seven-time Tour de France winner Armstrong.
Armstrong and others accused by Landis have denied the allegations and called into question the credibility of Landis, who was stripped of his 2006 Tour de France title for doping.
Armstrong, currently competing in the Tour de France, said Wednesday he was prepared to cooperate in a federal investigation -- as long as it does not become a "witch hunt".
"A long as we have a legitimate and credible and fair investigation, we'll be happy to cooperate, but I'm not going to participate in any kind of witch hunt," he said.
Although he has never failed a drugs test, Armstrong has been dogged by doping allegations in his career, accusations he has strenuously denied.
Lemond became the first American to win the Tour de France in 1986 and added victories in 1989 and 1990. Armstrong's period of dominance came a decade later, as he won seven straight titles from 1999-2005.