Spanish newspaper Marca understands that Angel Di Maria could be leaving Santiago Bernabeu at the end of the season.
The Argentine winger has been unable to agree a new deal with los Merengues and Real Madrid chiefs might decide to cash in on him in the summer before his value decreases.
Los Blancos need the cash to launch an assault on Gareth Bale and they are looking to get between €25m and €35m for the highly rated forward.
According to Marca, Manchester United, Paris Saint-Germain and Manchester City are keeping an eye on the situation, ready to pounce should the player become available for sale.
Di Maria, 25, joined Real Madrid in a €25 million deal from Benfica in the summer of 2010 and has since proved his worth at the biggest stage.
He has made a total of 85 La Liga appearances for los Merengues, and scored 16 goals in the process.