Charest was arraigned Wednesday on 47 charges including sexual assault and breach of trust involving eight female adolescents who were in the same age range. The alleged crimes occurred between 1991 and 1998.
Crown prosecutor Marie-Nathalie Tremblay said in an interview she objected to his release in order to protect the alleged victims and due to the gravity of the alleged offences.
The ninth woman to turn to authorities alleged she was sexually assaulted in the Mont-Tremblant area, which is home to an internationally recognized ski resort in the Laurentian mountains north of Montreal, said Mont-Tremblant police spokesman Eric Cadotte.
"We have reason to believe the majority of the (alleged) victims have come forward, but we think there could still be more."
Tremblay said Thursday afternoon she was unaware of the existence of a ninth alleged victim.
But she added the Crown knows more women, including some who do not live in Canada, may still file official complaints against Charest, 50.
Mont-Tremblant police have said the alleged assaults took place north of Montreal and in France, Austria, New Zealand and the United States.
Montreal La Presse reported on Thursday that Alpine Canada knew in 1998 about the allegations against Charest and fired him for that reason.
The newspaper cited several sources, including then-members of Team Canada, parents of skiers, and former employees of Alpine Canada.
La Presse also reported the young women believed they were having a monogamous relationship with Charest and that tensions flared among some of them after they learned he was allegedly having sexual relations with several athletes.
Alpine Canada CEO Mark Rubinstein refused an interview request Thursday.
A public relations firm hired by the ski organization said in a statement Alpine Canada is "presently collecting internal information in order to know more on the situation. Out of respect for the court process, we will not be making any other comments."
Charest is scheduled to appear in a courtroom north of Montreal on Friday when a date for a bail hearing is expected to be set.