NEW YORK — Lance Armstrong is chasing an eighth Tour de France title and an elusive feat: persuading everyone he's clean.

As Armstrong reunites with his close friend and Astana team director Johan Bruyneel, the man behind his yellow jerseys, he's also adding a new member to his support group. Anti-doping expert Don Catlin has been hired to test Armstrong anytime, anywhere — and to post the results online for the world to see.

"I think it's the first time an athlete can actually be totally validated on the chance he's successful," Armstrong said Wednesday. "In my opinion, Don Catlin is beyond reproach."

Armstrong disclosed details of his comeback two weeks after saying he would end a three-year retirement. He'll ride for Astana and will compete in the Tour Down Under in Adelaide, Australia, in January.

"I think we're sure we'll have success with the movement, because we need it," he said in an interview with The Associated Press, "but I'm not sure I'll be the fastest cyclist in the world."

Astana was banned from this year's Tour because of past doping violations. But Pat McQuaid, the leader of cycling's governing body, said he believed the team would be allowed to return in 2009.