Former All Blacks Dan Carter and Joe Rocokoko will reportedly be called before an independent French anti-doping tribunal to explain the presence of corticosteroids in urine samples.
The pair, who play for French top 14 club Racing 92, tested positive for steroids following a match in June, but were subsequently cleared of any wrongdoing in October by the French Rugby Federation.
However, French newspaper Le Monde reports France's College of the AFLD has refused to endorse the decision from the FFR and has sought explanations from the pair.
No date has been set for the hearing.
Argentinian player Juan Imhoff, who also tested positive alongside Rocokoko and Carter, will also be called before the tribunal.
Le Monde reports that experts from the AFLD will examine documents released by the FFR to not only determine whether rates are consistent with treatments reported by Racing 92's doctor, but also whether they've been taken by an authorised method.
Le Monde recalls that the AFLD procedure is not abnormal: it is "neither rare nor automatic" and "it does not presage a reversal of the decision of the FFR."