Australian boxer Bianca Elmir's hopes of competing at the London Olympics are in jeopardy after she was slapped with a provisional ban for failing a doping test at national championships in February.
Elmir, Australia's flyweight champion, had tested positive for a banned diuretic at the championships in Hobart.
She was notified of her suspension shortly after arriving in China last week to compete at the women's World Championships in Qinhuangdao, her manager Alex Belperio said.
"It's a provisional ban, that's all we know," Belperio said by telephone. "We appealed to have the ban lifted so she could compete in China, but the appeal was unsuccessful.
"It's been a bit of an emotional roller-coaster for her as you can imagine.
"We need to find out more information to determine what actions we can take in relation to this ban."
The 30-year-old Elmir was due to compete in the women's flyweight (48-51kg) category at the World Championships, where a first-place finish among the Oceania boxers would have booked her ticket to London, where women's boxing will debut.
She was regarded as one of Australia's strongest medal hopes in the sport.
The Australian Sports Anti-Doping Authority (ASADA) was unavailable to provide comment, but was expected to make a statement later on Wednesday.
In general practice, ASADA will only recommend Australia's sports authorities implement bans for doping violations after the athlete has returned positive results for a banned substance for two tested samples -- the "A" test and the second "B" test.
Boxing Australia declined to comment, but officials were distressed by the timing of the decision.
"You have to wonder whether tortoises could have handed it down any quicker," said Tony Whelan from Boxing ACT in Canberra.
"We would have hoped to have replaced her with the silver medallist, but of course there was no time to fly her over," Whelan said, referring to Kelly McGrath who was defeated by Elmir for the Australian title in Hobart.
Kristy Harris, who was hastily slotted into the draw to replace Elmir at the World Championships, was beaten in the first round on Saturday.
Elmir's coach Garry Hamilton said the boxer had taken a tablet before the national titles to treat "swollen ankles" on a long-haul flight.