Chelsea are in the hunt for a young centre-half this summer.
Blues manager Jose Mourinho is preparing for life without John Terry, though he is expected to be offered terms for next season.
The Daily Mail says Real Madrid's young centre back Raphael Varane has been watched regularly by Chelsea scouts this term.
Atletico Madrid's Uruguayan defender Jose Gimenez and Athletic Bilbao centre half Aymeric Laporte are also being monitored.
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