Chelsea are keeping tabs on Yaya Toure's situation at Manchester City.
Toure is still waiting to discuss new terms with City officials.
The Daily Express says Spanish sources suggest Real Madrid could be a possible destination, but Chelsea could be in the frame too as Toure's contract talks have reached an impasse.
The Citizens are expecting an exodus of players to leave in the summer, including Carlos Tevez, Edin Dzeko and Joleon Lescott.
Toure helped City to a 4-0 win over Newcastle at the weekend, but his side's hopes of defending the title are all but over.