"We don't have enough money. We have a lot of experts with us that we have to pay," Semenya said in a press conference in Johannesburg, noting that her next hearing at the European Court of Human Rights (ECHR) is scheduled for 15 May. 

"Anything you can contribute will make a huge difference," she added.  Her South African lawyers, who are assisting her pro bono, said the cost of the hearing could reach 170,000 euros (£145,000; $198,000). "It's completely ridiculous. That is why we are appealing to the public," said her lawyer Gregory Nott.

Semenya has a natural excess of male sex hormones but has always been legally identified as a woman. 

She has been battling the International Association of Athletics Federations (IAAF) for more than a decade, relentlessly demanding that her "dignity and human rights" be respected. 

The Grand Chamber of the ECHR agreed in November to examine the case of the double Olympic 800m champion (2012, 2016). 

The 33-year-old athlete had won a lengthy legal battle in July when the ECHR ruled in her favour at first instance against Switzerland, finding that she had been the victim of discrimination. 

However, the Swiss authorities, backed by World Athletics, announced their intention to take the case to the Grand Chamber of the ECHR, which acts as an appeal court and whose decisions are final. 

The initial decision was made by a narrow majority of four judges to three.