Zinedine Zidane has been called to give evidence at the trial of two Juventus officials accused of sporting fraud.
General manager Antonio Giraudo and club doctor Riccardo Agricola are accused of providing illegal drugs to players between 1994 and 1998.
Raffaele Guariniello, whose three-year probe into allegations of drug use in Italian soccer, made the request of Zidane.
“I have asked him to attend a hearing on December 19,” Guariniello told French newspaper Le Monde on Monday.
“I want to hear from other players. From Zidane and the others I expect the truth.
“They are witnesses in these legal proceedings and must tell exactly what happened in their club.”