After getting booed on Tour de France podium, Geraint Thomas defends his Sky team as 100-percent clean.

VALENCE, France (AFP) — Yellow jersey holder Geraint Thomas hit back at the doubters on Friday by claiming Team Sky is racing “100 percent” clean at the Tour de France.

Thomas, a former Olympic champion in track cycling, was dramatically booed off the podium on Thursday after claiming his second successive stage win in the high Alps to reinforce his overall lead.

It compounded a bittersweet day for the British outfit, who saw team leader and four-time champion Chris Froome spat at and pushed heavily by one of the many over-enthusiastic fans who line the 13.8km climb to the summit.

Team Sky’s dominance of the race has caused the doubters to compare their performances to those of U.S. Postal, the team once led by Lance Armstrong.

Armstrong, who won the Tour a record seven times, saw many of his most notable his cycling results erased when he finally admitted he had taken performance-enhancing drugs throughout his career.

The UCI recently closed an investigation into Chris Froome‘s anti-doping test from the 2017 Vuelta a España that showed an elevated level of asthma drug Salbutamol. Fans and media have criticized the UCI and the World Anti-Doping Agency for closing the case merely days before the Tour start.

But Thomas, who has a real chance of upstaging Froome to win the yellow jersey if the Kenyan-born champion fails to step up in the crucial third week, said the doubters are wrong.

“I 100-percent believe in myself and the team, that we do everything in the right way, along with the majority of the peloton as well,” said Thomas.

“I can’t say 100 percent for the peloton, but 99 percent I’m sure that everyone’s doing it the right way, working hard.

“I think it’s great for the sport. You look at all the anti-doping and all the tests and that type of stuff, and then you look at other sports.

“Cycling’s leading the way by a million miles, so I have every confidence in the sport at the moment.”

On stage 12, Geraint Thomas got a gap on his rivals with a sprint to the line. Photo: Tim de Waele/Getty Images

At the end of the mainly flat stage 13 Friday, won by Slovakian fast man Peter Sagan of the Bora-Hansgrohe team, Thomas looked sheepish as he stepped on to the podium to be presented with the yellow jersey.

In comparison to Thursday, there were practically no boos or whistling, incidents that were condemned earlier by race director Christian Prudhomme.

“All I can do is renew calls for calm, for good sense and for serenity with regard to the riders on the Tour de France,” Prudhomme told AFP. “Don’t whistle and, obviously, don’t touch the riders. Even if it’s just an over-friendly backslap.”

Welshman Thomas, who takes a 1:39 lead over Froome into Saturday’s undulating stage to Mende, said he is prepared for the flak.

“Obviously, you’d prefer everyone to cheer you, but I can’t affect that,” he said. “I’d rather be on the podium getting booed than sat on the bus and being cheered.”