Lawyers for the International Association of Athletics Federations will tell a court Olympic women's 800m champion Caster Semenya should be classed as a "biological male" who identifies as female next week.
While the IAAF will argue the 28-year-old South African should be classed as "biologically male" they will also suggest Semenya be allowed to compete in women's races if she takes testosterone suppressants, The Times reports.
The issue will be addressed in a five-day hearing at the Court of Arbitration of Sport seen as a landmark case surrounding athletes with differences of sexual development (DSD).
It's a case that will further bring the use of testosterone blockers into the spotlight. In 2018, the United Nations human rights special procedures body implored the IAAF to drop their regulations when it came to transgender athletes and testosterone blockers, claiming they "contravene international human rights."
Speaking to The Times, IAAF lawyer Jonathan Taylor said if the case went against them it would be a blow to athletes with normal female levels of testosterone, which are an average 15 times lower than the normal male range.