Austrian authorities have prepared charges against British historian David Irving, who was arrested 11 days ago.
Mr Irving denies Hitler knew Jews were being systematically killed
The charges are linked to speeches he made in 1989 denying the existence of gas chambers at Auschwitz, prosecutor Otto Schneider has said.
Mr Irving, 67, can appeal against the charges under Austrian law.
Mr Irving sued US historian Deborah Lipstadt in London in 2000 for labelling him a Holocaust denier. He lost in a comprehensive verdict.
He is currently in custody in Vienna after having been arrested in the province of Styria on 11 November.
A hearing has been scheduled for Friday to determine whether he should remain in custody for up to four more weeks.
COUNTRIES WITH LAWS AGAINST HOLOCAUST DENIAL
No trial has been scheduled yet.
Despite the mortal blow to his reputation in 2000, he remains a showman and may well relish the opportunity to grandstand before a wider audience if put on trial, BBC legal affairs analyst Jon Silverman says.
In his books, Mr Irving has argued that the scale of the extermination of the Jews by the Nazis in World War II has been exaggerated.
He has also claimed that Nazi leader Adolf Hitler knew nothing of the Holocaust.
Mr Irving was previously arrested in Austria in 1984.