Lance Armstrong's planned comeback in Australia may be thwarted by doping rules, International Cycling Union (UCI) President Pat McQuaid said on Saturday. Riders entering or re-entering professional cycling need to be in the UCI's anti-doping program and possess a biological passport six months ahead of competing. Seven-time Tour de France winner Armstrong said this week he wanted to return to the sport in the Tour Down Under with the Astana team. The race in Australia takes place on Jan. 20-25, four months from now. McQuaid said the UCI was looking into the matter but added it only “seems” that the American could have to delay his comeback. Armstrong, 37, was dogged by doping allegations during his career but never tested positive for a banned substance and has protested his innocence.
