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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Summer 2016 is set to be a very exciting time for football fans, as this is when the long awaited Euro 2016 tournament kicks off.
Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.