Ribery and France forward Sidney Govou have already been questioned and another player should follow, a police source close to the investigation told Reuters.
"Personalities including Franck Ribery and other players of international fame count in their relations a person close to the leader of an escort girls network," Ribery's lawyer, Sophie Bottai, said in a statement.
"It is only because of that relationship that they have been or will be heard by police investigating this case," she added.
Govou's lawyer, Thierry Braillard, said his player "was not involved in the case, neither directly nor indirectly." The player's club, Olympique Lyon, said in a statement they fully supported him.
French media said players heard by investigators were clients of a nightclub in Paris's posh Champs-Elysees district that allegedly featured escort girls.
