The Welsh athletes will learn the outcome of their doping hearing in January after they both tested positive for banned substances earlier this year, and were subsequently provisionally suspended and withdrawn from the Commonwealth Games.
The pair have both released statements to say neither had knowingly taken any banned substances.
Williams, the 2012 European 400m hurdles gold medalist, and Warburton, fourth at the Dehli Commonwealth Games over 800m, stood in front of a national anti-doping panel this week and are understood to have claimed contaminated supplements were to blame.
The January decision could benefit the duo with an World Anti-Doping Association code amendment due to come into affect that would allow for a short ban or just a reprimand if it can be proven that a positive test stems from a contamination.
