A court in Paris has ruled against delaying the trial of the former head of world athletics Lamine Diack and his son, who is in Senegal.
Both deny taking bribes to cover up doping by Russian athletes.
Lawyers for the son, Papa Massata Diack, say essential defence witnesses have been barred from attending due to coronavirus restrictions.
Senegal has refused to extradite him to France.
Lamine Diack, 87, led the International Association of Athletics Federations (IAAF) for 16 years until 2015.
He is under house arrest in Paris.
Source: bbc.com