The France international has told PSG that he wants to leave the club before the end of the transfer window, and Los Blancos are believed to have made an offer in the region of £137m for his services.
Perez has revealed that the Ligue 1 giants 'answered rudely' when the offer was made, as PSG are believed to be holding out for a much higher fee than the offer said to have been placed on the table.
"They [PSG] have already answered and rudely," Perez told Spanish journalist Jose Manuel Moreno.
Mbappe has scored 133 goals and registered 63 assists in 174 appearances for PSG since making the move from Monaco, initially on loan, in the summer of 2017.
The 22-year-old's current deal at Parc des Princes is due to expire next June, meaning that he would be free to negotiate a pre-contract with foreign clubs in January 2022 if he remains in Paris beyond the deadline.
Monaco 
Stade Brestois 29 
Bordeaux 
Nimes 
Bayern Munich 
FC Augsburg 
Paris Saint Germain 
Toulouse 
CSKA Moscow 
FC Rostov 
Leicester 
Chelsea 
Valencia 
Betis 
Dynamo Kyiv 
Chornomorets Odesa 
Verona 
Inter 
Bayer Leverkusen 
FC Heidenheim 
Borussia Dortmund 
SC Freiburg 
VFL Wolfsburg 
Union Berlin 
Arsenal 
Nottingham Forest 
Everton 
Brentford 
Spartak Moscow 
Lokomotiv Moscow 
Rangers 
Dundee Utd 
Atletico Madrid 
Alaves 
Lens 
Marseille 
Ingulets Petrove 
Shakhtar Donetsk 
AC Milan 
Juventus 
ST Malo 
Manchester City 
Tottenham 
Eintracht Frankfurt 
Werder Bremen 
Girona 
Espanyol 
Feyenoord 
Heerenveen 
ST Etienne 
Montpellier 
Grenoble Foot 38 
Heart Of Midlothian 
Celtic 
Reims 
Lyon 
PSV 
Groningen