Speculation has grown over the Spanish midfielder’s future after he was left out for two games by Chelsea manager Jose Mourinho in the last few weeks. Mata struggled to establish himself in Chelsea’s team at the start of the campaign as he battled for fitness, with Mourinho warning that he wanted him to adapt to his way of playing. PSG made a late bid before the summer transfer deadline to land Mata in a £30 million deal and sources close to the mega-wealthy French club have revealed that they are set on trying again in January. But Chelsea will resist any offer, and are not willing to let Mata go. A source told the Daily Express: “At the moment, Chelsea do not want to sell Mata, even if the offer is right.” Mata and Brazilian starlet Oscar have been told by Mourinho that the No 10 spot is there to be grabbed by one of them. Whoever is playing best will keep the shirt. So far, Oscar, with his better tackling ability, strength and willingness to track back, has been the man Mourinho has favoured.