Malaysia's badminton world No.1 Lee Chong Wei, who is ­reported to have failed an initial doping test, will travel to Norway on Sunday for follow-up testing, media said Wednesday.

Malaysian sports officials have confirmed that one of the nation's shuttlers failed a recent doping test but have declined to identify the athlete pending the test next week on a second urine sample.

But Malaysian media have widely reported that Lee - the country's top sporting star - was found to have traces of the banned anti-inflammatory drug dexamethasone in his system during the world championships in Denmark in late August.

The state-linked New Straits Times said Lee has made plans to fly to Norway with a top Malaysian sports official for tests at an Oslo laboratory on a second sample provided during the tournament.

The 32-year-old Lee has dominated badminton's world rankings for years, but has notably failed to win a world championship or Olympic gold medal.