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.
However, it's been revealed his representatives have also fielded enquiries from Real Madrid president Florentino Perez, who rates Courtois highly.
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