KUALA LUMPUR, Nov 12 — Datuk Lee Chong Wei’s lawyers have told former national shuttler Razif Sidek to retract defamatory allegations that the badminton world number one was a long-time user of a banned substance, Khairy Jamaluddin said today.

Youth and Sports Minister Khairy said Razif’s claim that Lee was involved in “systematic doping” was unfounded and irresponsible.

“If you want to make a serious allegation like that, you have to show evidence,” Khairy told a press conference after the Retirement Fund Incorporated’s (KWAP) leadership series event here today.

In August, Lee tested positive for anti-inflammatory agent dexamethasone after giving urine samples at the BWF World Championships in August in Copenhagen, where he lost to China’s Chen Long in the final.

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Dexamethasone is not a performance-enhancing substance but its use is banned in active competition.

Today, the minister stressed that it was a clinic that had administered dexamethasone to Lee for his rehabilitation from an injury.

Razif, formerly a national badminton doubles player, had made his allegations to news portal The Rakyat Post that were published yesterday.

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News agency Reuters reported the Badminton World Federation as saying yesterday that Lee, 32, has been provisionally suspended for an “apparent” anti-doping violation; he now faces a possible ban of up to two years.

On his Facebook account, Lee has denied using drugs to help him gain an advantage.