Bayern sporting director Matthias Sammer apparently told German sports news agency SID that "we will tell him that we stand by him and that he will get our best support".
Ribery, Benzema and seven others have been informed by an investigating magistrate that they will need to stand trial over the allegations which surfaced before the 2010 World Cup finals.
It is alleged that Ribery and Benzema paid a 16-year-old girl for sex after meeting in a Paris bar. The girl said the players were unaware that she was not 18.
Soliciting sex with an under-age prostitute is punishable by up to three years in prison in France with a maximum fine of £35,000.
Ribery's lawyer is astonished by the magistrate's decision after another judge said that the two players had no case to answer.
"This decision is as surprising as it is unfair with regard to the contents of the dossier and the requests of the prosecutor's office. But I remain confident about the outcome of the process," said his lawyer Sophie Botta.