"In relation to stories appearing in different news media, referring to the supposed signing of Manchester United player Cristiano Ronaldo, the club categorically deny the reports," Real said on their website.
"There is no pre-agreement to this effect with the player, with his agent or with Manchester United. As is well known the club tried to sign the player last summer and Manchester United made it clear he was not for sale."
Earlier, Real presidential candidate Juan Onieva said in a radio interview that he was aware of a pre-agreement with the Portugal winger that was set up by former president Ramon Calderon.
He said there was an obligation on both parties to come up with an indemnity payment if either changed their mind by June 30.
"I wouldn't go through with it. If I had to take a decision I would contest the deal. I think it's madness," Onieva told Onda Cero. "I only know the terms in general; I haven't seen the document."
The interviewer mentioned a figure of 100 million euro, to which Onieva replied: "I think it is a little less than this, because the deal was made in pounds.
"In terms of the figures, as far as I am aware, it is not right to pay that amount of money especially in times like these. It's almost offensive. Also I don't think he is the solution for Real Madrid."
Onieva, former president Florentino Perez and the little-known Eduardo Garcia have said they will stand in the election which is due to take place on June 14.
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