Tim Don's hopes of qualifying for the 2008 Olympics have been hit after he broke an elbow in a crash at the Beijing Triathlon World Cup.
After a decent swim, Don is floored in Beijing by a fallen bike
The 29-year-old has not yet achieved the qualifying standard for the Beijing Games and now has one last chance to do so at next May's Madrid World Cup.
Don is expected to miss six weeks training while the bone heals.
In May, Don, the 2006 world champion, won an appeal against his Olympic ban for missing three drugs tests.
The Londoner was handed a three-month suspension just weeks after winning his world title for missing three tests during an 18-month period.
I've called it quits for the season now and I won't race until next year
However, the British Olympic Association cleared Don after agreeing there were "significant mitigating circumstances".
Don's chances of qualifying for the 2008 Games were ruined in Beijing when he crashed into a competitor's fallen bike and catapulted over his handlebars.
A specialist in London confirmed that Don, who finished 10th at this year's World Championships, had fractured his elbow.
"I've called it quits for the season now and I won't race until next year," Don told BBC Sport.
"The fracture is in a very painful place but I hopefully won't have to have an operation.
"The timing of it is pretty bad, though. I should be in Korea now with my coach looking at our pre-Beijing training base.
"But that's all off now as I've just got to rest up."
Great Britain's men are ranked in the world's top eight and so can take three athletes to the Olympic Games.
The next chance to qualify comes in Madrid when athletes must at least finish in the top eight. However, selectors have the option of picking an athlete at their discretion.
"The main Olympic qualifier is the World Cup race in Madrid next May," Don added.
"It was chosen because it has a no-wetsuit swim, hilly bike section and warm conditions - but it also always has a very strong field."