After the signing of Brazilian star Neymar - Barcelona must now look towards defence as they try and regain their status as the most feared side in Europe.
Looking at the La Liga statistics of the previous season, Barcelona scored 115 goals in 38 matches and conceded 40 goals - 11 more than the previous season.
the Catalans started off well but were frustrated at the end of the season when they lost 7-0 aggregate score to Bayern Munich in the Champions League semi-final.
Although, they managed to clinch the La Liga title, their defence looked shaky at times with the ageing Carles Puyol injured and Javier Mascherano fitting in his position, too eager to slide early. Gerard Piqué restored some stability in the defence but it didn't look enough.
If Barcelona are to compete for Champions League glory once, then they need to buy a quality defender now.
Of course that would mean a depressing morale for their young defensive talents like Marc Bartra, Muniesa, but their inexperience may cost Barcelona more next season. So, Barcelona definitely need some backups in the back.
Here are four players that would perfectly fit into the regime at the Nou Camp.
1. David Luiz
David Luiz has divided opinion throughout his tenure at Chelsea, however many see him as a perfect fit at the Nou Camp. His attacking style of play, and great technique, means he would comfortably settle in at the Catalans. Any such transfer will depend on whether Jose Mourinho sees Luiz as an integral part of his plans at Stamford Bridge.
2. Thiago Silva
The former AC Milan man and PSG captain has been rock solid at the back for the French outfit. He could be a great addition to the catalans and would form a strong defensive unit alongside Gerrard Pique.
3. Mats Hummels
Mats Hummels has been the star at the back for Borussia Dortmund.
Much of Dortmund's success, at the back, was down on his tough shoulders and he certainly impressed all. Barcelona need someone like him to replace Carles Puyol.
4. Vincent Kompany
The Manchester City captain has been a wall at the back for his club in previous seasons. The Belgian international could easily slip into any team in world football and if he was to join Barcelona he could only add extra steel and quality to the Catalans back-line.
If any of these world-class centre-backs end up at the Nou Camp this summer, then the European power shift may return back to the Catalans.
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