Metro reports that Valencia believe they are leading the race to sign the 25-year-old in January.
Arsenal, Tottenham, Manchester United and Real Madrid are also reportedly keeping tabs on Mata’s situation at Stamford Bridge.
Mata is considering his future at Chelsea after having fallen down the pecking order at the club following the return of manager Jose Mourinho.
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The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.
Five English clubs will compete in the last sixteen of the Champions League for the first time ever as Liverpool, Manchester United, Manchester City, Chelsea and Tottenham face some difficult away matches.