South African cyclist David George, a former team-mate of Lance Armstrong, has tested positive for blood-boosting EPO.
South Africa's Institute for Drug-Free Sport says George, who cycled with the disgraced Armstrong on the US Postal Service team in 1999 and 2000, failed a doping test on August 29.
SAIDS says George has been provisionally suspended and faces a doping tribunal.
SAIDS chief executive Khalid Galant said: "His (George's) biological passport indicated suspicious activity and that triggered a targeted test for EPO."
Armstrong was last month banned for life by the International Cycling Union and stripped of his seven Tour de France titles for doping.
George is also a two-time Commonwealth Games medalist.