Lance Armstrong says he will be vindicated by a U.S. Anti-Doping Agency investigation of claims raised by a report in Sports Illustrated.
Armstrong used Twitter on Friday to suggest that USADA may probe allegations published by the magazine this week in an article entitled "The Case Against Lance Armstrong."
"Great to hear that USADA is investigating some of SI's claims. I look forward to being vindicated," the seven-time Tour de France winner said.
Armstrong is currently competing in the Tour Down Under in South Australia and has refused to comment on the Sports Illustrated report, other than to say he has nothing to worry about "on any level" from its claims. He would not speak to reporters after the fourth stage on Friday and could not be contacted later in the evening.
No immediate confirmation was available Friday that USADA has launched an investigation into the report. The agency's website contained no information about any pending investigation.
Sports Illustrated reported that when Italian authorities raided the home of Armstrong teammate Yaroslav Popovych last November in Italy, they found texts and e-mails linking their Radio Shack team with Dr. Michele Ferrari as recently as 2009.
Armstrong publicly severed his connection with Ferrari in 2004, amid accusations the doctor aided another rider in using performance-enhancing drugs. Ferrari was convicted and then later cleared of criminal charges on appeal.
Armstrong spokesman Mark Fabiani called the Sports Illustrated report "old news from the same old, discredited sources."
A federal grand jury in Los Angeles has been hearing evidence for months on cheating in professional cycling. The investigation turned toward Armstrong - and several of his associates have testified - since former teammate Floyd Landis accused him of systematic doping.
Armstrong won the Tour de France every year from 1999 to 2005. He is currently 85th overall and nearly 4 minutes behind the leader after four stages at the Tour Down Under, which he has said will be his final race outside the United States.