There has been a lot of speculation surrounding the future of Chelsea's David Luiz.

Mourinho doesn't seem too keen on the Brazilian, owing to his adventurous attitude and habit of losing possession in dangerous areas. Bayern Munich and Barcelona both seem to be interested, and should they decide to sell, Chelsea can pocket at least £40 million. However, there is absolutely no doubt that Luiz is just as vital to the squad as Lampard, Mata, Hazard and Oscar.

Luiz is a very modern centre-back, and no doubt the fastest one that Chelsea have at the moment. His adventurous attitude may be risky, but let's not forget how important it is, as if he hadn't strayed away from his position, he wouldn't have notched his first goal, a glorious volley against Manchester United.

The Brazilian is also a good threat in the air, and due to his pace and versatility, he often loses his marker in the opposing penalty area, although his own marking needs some improvement. Partnered with John Terry, Gary Cahill or Branislav Ivanovic at the centre of defence, it won't be easy for opponents to even test Cech.

Mourinho needs to realise that David Luiz is simply irreplaceable. Playing Luiz in defensive midfield is also an option, but Chelsea already have the likes of Mikel, Ramires, van Ginkel, Lampard and Essien, so it wouldn't really be a viable option.  

The Brazilian injects a much needed bit of flair in the Blues' back four, and without him, Chelsea's performance next season could suffer drastically.

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