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Chelsea manager Jose Mourinho is assembling his version of the Invincibles with the intent of not having a weak link in the team.
Fernando Torres is desperately clinging on to his excessive and inflated contract a la Winston Bogarde, so signing Costa addresses Chelsea's weak link of not being able to rely on a No. 9.
Despite receiving Mesut Ozil-like criticism in Spain, Fabregas is Premier League-proven and a world-class passer.
Finding an elite left-back is rare, but Luis bolsters Chelsea's back four.
Pasalic is a cash cow who has been loaned out to Elche, per Heath Chesters at Inside Spanish Football.
Chelsea owner Roman Abramovich avoided making knee-jerk decisions late in the transfer market.
"The market closes Aug 31 and we close our market on July 18," Mourinho said, per Matt Law at The Telegraph. "We did our business in almost record time."
In return, Abramovich will be expecting attacking and free-flowing football to be Chelsea's method of winning trophies.
£39.2 million for Luiz? This was Abramovich's reaction.
Ba was a serviceable centre-forward for Chelsea who had expended his best football for Newcastle United.
After years of being mocked as Ca$hly, Cole proved his haters wrong.
Instead of going for financial gain playing in Major League Soccer or the Middle East, he will extend his European top-flight career by playing for Roma.
"Roma is an ambitious club, it's a challenge for me and I'm prepared to fight for my place," Cole said, per The Guardian. "This is a chance for me to try a different language, culture and way of living."
Hazard and Kalas are two of the many Chelsea young guns loaned out.
Chelsea also released Frank Lampard, Henrique Hilario and Samuel Eto'o.
Lampard is one of the greatest footballers in Premier League history and a consummate professional.
Hilario was a handy squad player who has a stack of trophies from his Porto and Chelsea days.
Eto'o's relationship with Mourinho was never the same after the age-cheating accusations, per Sky Sports.