PETALING JAYA - Embattled world No. 1 shuttler Lee Chong Wei has confirmed that he will be suing former Malaysian national player Razif Sidek and a Malay daily newspaper over allegations that he was involved in doping.

"The allegations are not true. Just because I have a doping case now, you can't simply say anything. Does he have any proof to justify his claims?" he told The Star Online on Tuesday.

Lee, 32, served a letter of demand through his legal team Song and Partners to Razif and the daily last week. Razif had claimed in the newspaper report that Lee had been using banned substances for a long time and that Badminton Association Malaysia officials were aware of it.

Last month, the Badminton World Federation (BWF) suspended Lee from all tournaments after both his A and B samples were found positive for banned substance dexamethasone. Lee is suspended until a hearing is carried out by BWF.