Real Madrid are watching Marcos Alonso's situation at Chelsea.
The fullback moved to Chelsea in August from Fiorentina and established himself as a first-choice for the Premier League champions-elect.
Marca says Real are exploring the prospect of re-signing the former Castilla fullback.
Alonso is seen at Real as cover for Marcelo, but face a tough task prising him away from Chelsea.
Blues boss Antonio Conte has no interest is losing the Spaniard this summer.