After United reported Real to FIFA over their crass pursuit of Cristiano Ronaldo, Calderon launched a bitter attack on Sir Alex Ferguson and Carlos Queiroz.
The Sun says Calderon is furious at boss Fergie for linking Madrid with former Spanish dictator Franco and United No 2 Queiroz for saying Portugal kicked the Spaniards out of their country.
The Real supremo bleated: "It seems grotesque to talk about Franco and the occupation of Portugal. It wasn%uFFFDt a very fortunate thing to say.
"It is United%uFFFDs right to complain but Real Madrid have done nothing irregular and we will never do that.
"We've not interfered and we won't interfere.
"It's impossible that they have proof of the contrary because it's something that has not happened. It's a matter between the player and his club."