Juan Mata
Juan MataReuters

Juan Mata is frustrated about his struggles at Chelsea and has already decided to leave the club during this transfer window, reports in Spain claim.

The 25-year-old playmaker has been marginalised by manager Jose Mourinho during the first part of the season after being a pivotal player during the last two campaigns, winning the Player of the Season for two years in a row and leading the Blues to successive Champions League and Europa League victories.

Mata's exile from the line-up continued in his team's 3-1 victory over Manchester United, and Spanish Online newspaper Sportyou reports that the Asturian maestro is already in talks to leave the club as he has decided to force a January exit.

Mourinho admitted recently that the "club's door is open" for Mata, should the Spaniard decide to make a move away, and according to the reports that moment has arrived.

"Mata is tired of his situation at Chelsea. His increasing distance from Mourinho and his continued absences from the team has prompted him to make the decision to leave Chelsea this January. He can not stand spending more time on the bench and the only solution is an exit," Sportyou reportss.

The Spanish newspaper also claims that Mata's desire to make the trip to next summer's World Cup has played an important part in his decision.

The report added that there are already a number of clubs interested in the player and the only condition that Mourinho will put to the deal is to notstrengthen any other Premier League rival, unless it allows Chelsea to secure the services of a top-class replacement as long-term target Wayne Rooney.

Mata has started just 11 Premier League games this season and he is yet to score a goal, failing to replicate the form of the last two seasons. Furthermore, since he showed his frustration after being replaced in the New Year's day game against Southampton, he has been an unused substitute for Mourinho in the club's last three games.

Eden Hazard, Oscar and Willian are ahead of the Spain international in Mourinho's plans, and during the last month reports have suggested that Paris Saint Germain, Barcelona, Atletico Madrid and Napoli are all interested in taking advantage of Mata's situation.