Tour de France leader Chris Froome plans to undergo independent physiological testing in a bid to put to bed allegations over his performances.
Following his dominant win on the first mountain stage of this year's race, the 2013 champion was again forced to deny he has ever used performance enhancing drugs.
Froome has repeatedly insisted he is clean, but years of watching drug cheats win the Tour has left many sceptical, with Team Sky boss Sir Dave Brailsford revealing ahead of stage 10 to La Pierre-Saint-Martin that the 30-year-old's training data had been hacked in an attempt to prove he is doping.
And, it has since reported that Froome plans to allow independent doctors and assorted experts to examine him ahead of the start of the Vuelta a Espana on August 22 in order to ascertain what makes him such an exceptional athlete.
"What haven't I done? I've tried to be as much as a spokesman as I can for clean cycling," Froome said after stage 10.
"I've spoken to the CIRC (Cycling Independent Reform Commission), I've made suggestions to the governing body to implement things like night-time testing.
"I've pointed out when I've felt there hasn't been enough testing, in places like Tenerife.
"What else is a clean rider supposed to do?"
As of Tuesday, Froome was in what some believe is an insurmountable position, with closest challenger Tejay van Garderen two minutes 52 seconds behind and third-place Nairo Quintana lagging over three minutes off the pace.