Lance Armstrong received strong backing Friday from cycling’s domestic governing body, which said accusations against the seven-time Tour de France champion were “completely without credibility.”

“Preposterous is a strong word, but it is warranted in this case,” said Gerard Bisceglia, chief executive officer of USA Cycling.

Armstrong has denied reports in the French media this week that he used a banned blood booster in his first tour victory in 1999. The sports newspaper L’Equipe reported that new tests on six urine samples Armstrong provided during the 1999 tour resulted in positive results for the red blood cell-booster EPO.

“Lance Armstrong is one of the most tested athletes in the history of sport, and he has come up clean every single time,” Bisceglia said. “This kind of years-ago testing of a single sample with new technology is completely without credibility.

“What’s worse is that Lance cannot defend himself because there is no mechanism for final resolution,” he said.

Although Armstrong has not said whether he would pursue legal action, Bisceglia said USA Cycling would support him in whatever way he chose to “denounce these accusations.”