Update 14:30 CET: Drenthe's agent has now confirmed the Facebook page is a hoax and is also planning to take legal action on the hoaxer behind it. He added that his client will be staying at Real Madrid this season.
He told BBC Sport: "Royston does not have a Facebook page, a Twitter page or a MySpace page. We will be taking legal action against the person who set up this false Royston Drenthe account.
"Royston is definitely staying at Real Madrid. He is happy there, he has spoken to the club directors and is looking forward to the new season at the Bernabeu."