Chelsea will demand £21m from Barcelona for goalkeeper Thibaut Courtois, according to Spanish newspaper Sport.

The 21-year-old, who is currently on loan at Atletico Madrid for the third successive season, has yet to play a match for Chelsea and recently revealed that he is not prepared to return to Stamford Bridge next season to sit on the bench.

Courtois has established himself as one of the best goalkeepers in La Liga - as well as Belgium's first-choice ahead of Liverpool's Simon Mignolet - and Barcelona are considering him as their long-term successor to the departing Victor Valdes.

A recent poll by Mundo Deportivo found that a significant number of Barcelona supporters regard Courtois as the best possible replacement for Valdes, who is tipped to join AS Monaco at the end of the season, rather than Borussia Mönchengladbach's Marc-André ter Stegen or Manchester United's David de Gea.

However, whether Jose Mourinho would sanction the sale of arguably the world's best young goalkeeper to Barcelona is another matter entirely.

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