Rugby star Dan Carter could be suspended after a drug test tested positive for steroids.

Traces of a steroid were discovered after a urine sample was taken from Carter, aged 34, at the Top 14 final last season. He will now be expected to explain how the steroid came to be in his system at a hearing before an FFR medical commission.

If the commission decides he breached the rules, he could be banned from rugby for two years. But Carter’s agent Simon Porter says he was allowed to take the drug for a calf injury he had suffered in the European cup final a few weeks before the drugs test and had been given a Therapeutic Use Exemption (TUE).

Club denies any wrongdoing

A statement from his rugby club Racing 92 denied a TUE was in place but said: “It was treatment administered in an authorised manner, given in response to a proven condition several days before the Top 14 final and not requiring a TUE. All the medical procedures on the players were carried out in total respect of the national and international anti-doping rules.”

It added: “We understand the commotion stirred by the word ‘steroid’because it can correspond to immoral and illegal behaviour. It can also correspond to known legal practices that are justified by medicine.”

Carter was a member of the New Zealand All Blacks team when it won the 2015 Rugby World Cup.

Drug testing is commonplace in sport to ensure that athletes are not taking any substances which could unfairly enhance their performance and give them an advantage over their rivals. However, testing is also carried out by certain industries to ensure workplaces are drug-free and to maintain health and safety for employees and members of the public.

Workplace drug testing is commonly used in safety-critical sectors like the oil and gas industry, aviation and construction.