Juan Mata will have to hand in an official transfer request if he wants to leave Chelsea in the winter transfer window, reports Le 10 Sport.
The Spanish playmaker has been one of the few casualties of the Jose Mourinho era at Stamford Bridge, falling down the pecking order despite being Chelsea's best player of the two previous seasons.
He has so far started just over half of Chelsea's Premier League games and is considering a January exit in order to seal his place at next summer's World Cup with defending champions Spain.
Paris Saint-German have been previously linked with an interest in the 25-year-old with a bid of around £35m being considered by manager Laurent Blanc.
But despite falling behind the likes of Oscar in the Stamford Bridge pecking order, Mourinho is still reluctant to let Mata go and will only commission the sale should the player launch an official transfer request.
But despite concerns that his future may lie away from west London, Mata is concerned about moving six months before a World Cup as it will mean he will not be allowed to compete in the Champions League again this season.
There are also concerns that he could fall in to the same situation at Parc des Princes.
Blanc currently has Javier Pastore, Ezequiel Lavezzi, Lucas Moura and Jeremy Menez in the left-sided attacking midfield role and Mata would have to compete with all of them for a place in the starting line up.
It is reported that the player is considering waiting until after the World Cup to demand a move away from Chelsea.
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