Track cyclist Jobie Dajka has lost his appeal against his expulsion from Australia's Olympic team.
The ex-world keirin champion was taken off the team after being charged with bringing the sport into disrepute when he admitted lying to a doping inquiry.
Dajka appealed to the Sydney-based Court of Arbitration for Sport but it ruled on Monday the ban should stand. Furious Dajka said: "I'm probably the first to be ejected from an Olympics for taking a vitamin. It's a joke."
He added: "I will just have a month off and start again. It's what I live for. I've done nothing wrong."
Dajka had initially denied injecting any substances in the room of former team-mate Mark French.
But he was forced to backtrack after tests found traces of his DNA on vials and syringes discovered in a waste bin.
There is no suggestion that Dajka used any banned substances but, under Australian Olympic Committee rules, athletes can be expelled for bringing the team into disrepute.
His place on the team will now go to Ben Kersten.