Why is everybody so sure that Mata would leave Chelsea?

[Brentwood]

Of all the players, he's the one that people are saying Mourinho will get rid off, but why? I'm missing something I think

[Snin]

http://www.youtube.com/watch?v=g4aiPxbDdcM

[Mc Gooner]

[One Wilf Copping]

http://www.telegraph.co.uk/sport/football/teams/real-madrid/ 9515422/Michael-Essien-repeatedly-calls-Jose-Mourinho-daddy- at-Real-Madrid-unveiling.html (http://www.telegraph.co.uk/sport/football/teams/real-madrid/9515422/Michael-Essien-repeatedly-calls-Jose-Mourinho-daddy-at-Real-Madrid-unveiling.html)

[Tornado]