Despite the World Cup winner having less than 18 months remaining on his contract, sporting director Leonardo has long insisted that the France international will not be sold during the summer.
However, the current financial climate may dictate that the Champions League runners-up will have to accept a big-money offer if it is presented to them ahead of 2020-21.
According to AS, long-term admirers Real have acknowledged that they may have to pay £200m to get the transfer over the line.
Los Blancos are said to be ready to sell six players in order to fund a move for the 22-year-old, who has also been linked with Liverpool.
The Spanish giants are in the process of reducing their wage bill, a task which will need to be intensified if they wish to accommodate the arrival of Mbappe.