British cyclist Chris Froome has denied any wrongdoing despite a drug test that showed the Team Sky rider had double the allowed amount of legal asthma drug Salbutamol in his urine.
The drug is allowed without the need for a therapeutic use exemption (TUE), but is limited to certain dosage amounts.
Froome, a four-time Tour de France winner, insists that he has not broken any anti-doping rules.
"I understand this comes as a big shock to people," he said. "I certainly haven't broken any rules here."
The 32-year-old, who is also the reigning champion of the Tour as well as the Vuelta a España, added: “I can understand a lot of people's reactions, especially given the history of the sport. This is not a positive test.
"The sport is coming from a very dark background and I have tried to do everything through my career to show that the sport has turned around."
With investigations into Froome’s test results potentially taking a number of months, Britain’s most successful road cyclist could still have the focus on him when his season begins in the spring.