8 players Chelsea were WRONG to sell: Letting Arsenal sign Petr Cech one of many Blues MISTAKES

7) Andre Schurrle

An underrated winger, Andre Schurrle showed some moments of class in his Chelsea career, but has also been allowed to join Wolfsburg.

8) William Gallas

Another key player sold to Arsenal, William Gallas was one of Chelsea’s best players back in 2006 but went on to captain the Gunners.