For years, George Hincapie was not only a key cog on Lance Armstrong's cycling team but also one of Armstrong's closest friends.

Now, according to a report by "60 Minutes," Hincapie has joined other members of Armstrong's inner circle in claiming the seven-time Tour de France winner used performance-enhancing drugs.

In what could prove to be some of the most damaging testimony yet against the world's most famous cyclist, Hincapie reportedly told the grand jury in the Armstrong case that he and Armstrong supplied each other with the endurance-boosting substance EPO and discussed having used another banned substance, testosterone, to prepare for races.

The segment of the "60 Minutes" report dealing with Hincapie, which cites unidentified sources, aired Friday night on the "CBS Evening News." A day earlier, the network broadcast an interview with another former member of Armstrong's U.S. Postal Service team, Tyler Hamilton, who said he also used PEDs with Armstrong.

Hincapie often has been depicted as one of Armstrong's most loyal teammates on the U.S. Postal team and was with him for all seven Tour victories. In an interview last year, Armstrong said Hincapie was "like a brother to me."

Hincapie is among a number of former Armstrong teammates and employees who have appeared before a federal grand jury in Los Angeles investigating doping in cycling. Hamilton said he testified for six hours before the panel.

Armstrong has never tested positive and has steadfastly denied doping.

"In its unpardonable zeal to smear Lance Armstrong, CBS has also attacked the

reputation of George Hincapie," Armstrong spokesman Mark Fabiani said in a statement Sunday. "We are confident that the statements attributed

to Hincapie are inaccurate and that the reports of his testimony are unreliable."

Reached by The Associated Press at the Tour of California in Solvang, Hincapie said he didn't want to talk about the "60 Minutes" report.

"It's just unfortunate that that's all people want to talk about now," he said. "I'm not going to partake in any cycling-bashing. I have done everything to be the best I can be. ... I want the focus on the future of the sport, what it's done to clean itself up. I believe in cycling and want to support it."