Brazilian former world champion gymnast Daiane dos Santos has tested positive for the banned diuretic furosemide.

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The 26-year-old, world champion in the floor exercises at the 2003 world championships in California, gave the positive sample in an out-of-competition, according to the International Gymnastics Federation.

Dos Santos, who is recovering from knee surgery and has not competed since last year's Beijing Olympic Games, has until November 13 to ask for a hearing and 21 days to make an appeal.

According to the World Anti-Doping Agency's code, the suspension for a first offence is two years.