Perez denies reports that Iker Casillas and Sergio Ramos warned that he faced a dressing room revolt if Mourinho stayed.
"I'm convinced that there is no conspiracy against Real Madrid," Valdano was quoted as saying by Marca.
"I think Florentino came out to try to contain a problem that might have spiralled out of proportion if the club didn't nip it in the bud.
"The fact that Florentino is involved means it is no ordinary story. I don't think Real Madrid have been destabilised, though."