Fans of Chelsea may be on alert after recent rumours surfaced that the Blues could sell Juan Mata.
Let us have a look at why this should absolutely not happen and why it most likely will not.
Mata is heavily relied upon. He is one of the players that Chelsea will always want to make sure they have available on match day.
With Mourinho speaking to Chelsea TV and saying he wants to improve the squad and work with his players before buying any more, rest assured Chelsea fans, Mata's importance to the club surely means if new players do come in, the Spaniard will not be going anywhere.
There already are very few players you would want to replace him with anyway, and he will only get better. To let go of a player with his quality at a rebuilding stage at the club would not make any sense.
Mata is no ordinary midfielder. He has been given the name of midfield maestro for a reason. At just 18 years of age, he played for Real Madrid Castilla and finished as the team's second top scorer with ten goals in the 2006/07 season.
When he signed for Valencia in 2007, he became the team's best young player of the year in his debut season for them and went on to become one of the club's key players, winning the Copa del Rey and going on to make over 175 appearances.
Mata stayed at Valencia until the 2011/12 season, when he came to England and joined Chelsea for €28m. In his debut season he won the Champions League and FA Cup, while also becoming the club's Player of the Year, which he then won the following season as well.
In his first season at Chelsea, Mata scored on his debuts in the Premier League, FA Cup, Champions League, Capital One Cup and Club World Cup - quite an impressive achievement.
The following season, he helped Chelsea to lifting the Europa League, joining Fernando Torres as the only two players to have won all four major tournaments: the Champions League, Europa League, World Cup and European Cup.
It was Mata who provided the assist to Branislav Ivanovic's header at the end of the game from a corner to win Chelsea the Europa League, which he also did for Didier Drogba's equaliser against Bayern Munich in last season's Champions League final, which the Blues went on to win.
Mata is a key player for Chelsea: his ability to not only to provide fantastic assists with his brilliant crosses, but to score goals as well, has made him very valuable. Mata is also a brilliant free-kick taker like his team-mates David Luiz and Frank Lampard.
Mata currently has 118 appearances for Chelsea, scoring thirty one goals. If he were to leave Chelsea, it would be quite a blow for them. The Premier League would also be losing a fantastic player as he is great to watch.
Although he will be linked with clubs this summer, he will most likely remain a blue.
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