Both Madrid giants and a host of Premier League clubs including are monitoring the situation with Manchester United midfielder Kobbie Mainoo.
Daily Mail Sport understands that Real Madrid and Atletico are keeping tabs on the England international, who is struggling for game time under Ruben Amorim.
Sources have disclosed that a season-long loan move could be of interest to those in the Spanish capital, with the transfer window due to close on Monday.
Mainoo, who has risen through the ranks at Old Trafford, has not played a minute of United’s two Premier League matches this season.