Franck Ribery said he is not worried about his career despite being charged this week with having sex with an under-age prostitute, because he did not knowingly do anything wrong.

"I am not scared about my future or about my career, either in the (French) national side or at Bayern Munich," Ribery told the German daily Bild in an interview.

"I never knowingly did anything wrong," Ribery said.

The 27-year-old, who was questioned for seven hours in Paris on Tuesday and faces up to three years in prison if convicted, has admitted paying for sex with Zahia Dehar but denies knowing the call girl was under 18 at the time.

Ribery's French international team-mate Karim Benzema has also been put under investigation on charges of having "solicited an under-age prostitute" over the Real Madrid player's alleged relations with the same teenage call girl.

German prosecutors said on Thursday that they had also opened a preliminary probe, but a spokeswoman stressed that Ribery could not be prosecuted for the same crime twice.

Dehar has said that Ribery had her flown over from Paris and that they had sex in a luxury Munich hotel on the player's 26th birthday in April 2009. He has admitted paying for her flight and hotel room.

In both France and Germany, paying for sex with a prostitute under 18 is illegal. In Germany the maximum penalty is five years behind bars.

"I have to get through this low point. It's not easy, but I have to get through it. I am a player very much in the public eye. It's not always easy to live with this pressure. The pressure is huge," Ribery told Bild.

"I hope that all this talk about my private life will end soon, because the most important thing for me is football. I want to have fun again and just focus on that."

Ribery is a highly valued member of Bundesliga champions Bayern, although last season he was plagued with injury and was suspended for their Champions League final defeat to Inter after a red card in the semi-final first leg.

The future of both Ribery and Benzema within the France team is however uncertain with France's minister for health and sport Roselyne Bachelot deeming their judicial problems to be incompatible with selection for the national side.

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