Chelsea face a battle to keep hold of Thibaut Courtois long-term.
The Belgium goalkeeper is beginning a third consecutive season on-loan with Atletico Madrid.
El Confidencial says Chelsea's attempts this month to open talks over a new contract have been blanked by Courtois' management.
The youngster remains concerned over his long-term prospects at Chelsea with Petr Cech's powers showing no signs of waning.
However, it's been revealed his representatives have also fielded enquiries from Real Madrid president Florentino Perez, who rates Courtois highly.
