#10. Arjen Robben
Robben has recently stated that he doesn’t believe he showed his true potential during his initial stint at the West London club. However, that doesn’t mean he had an unsuccessful season during one of the clubs most successful seasons. Since leaving Stamford Bridge he has grown to become one of the most formidable playmakers in the world.
#9. Mario Parsalic
The Croatian international was snapped up for £2.5million and then loaned out to Elche in La Liga. His performances there have been impressive to say the least and he looks forward to taking his first-team experience back to Chelsea.
#8. Ricardo Carvalho
Having already played under Mourinho at Porto, Ricardo was one of the first signings taken by the Portuguese coach costing $36 million in the sucker of 2004. He was 26 years old at the time and formed a great pairing with John Terry in front of Peter Chech. The defender consistently gave solid performances at Stamford Bridge and followed Jose when he went to Real Madrid.
Costing £24.5 million from Lyon was another wonderful addition by the “special one”. Over the course of the next seven seasons, the central midfielder became an intimidating presence for the opposition.
#6. Michael Ballack
It is hard to believe that the German wizard arrived at Stamford Bridge on a free transfer in May 2006. Michael certainly exceeded his transfer fee as his presence helped the squad beat the likes of Real Madrid and Ac Milan. The club clinched the Premier League title and three FA Cups during his tenure.
#5. Diego Costa
Last summer saw the signing of this striker from Atletico Madrid. The past season has seen Diego plagued by injury but that hasn’t stopped him from taking his goal tally into double figures during Chelsea’s recent successful Premiership campaign.
#4. Cesc Fabregas
Cesc is under some flak from Arsenal supporters since arriving at Stamford Bridge. However, despite this he has remained consistent in his performances which has seen him win his first Premier League title.
#3. Branislav Ivanovic
Jose has recently spoken of the Chelsea defender as one of the clubs best ever signings. Branislav Ivanovic has been a positive influence within the defense as the right-back has helped Chelsea have a successful season. He has also scored a few decisive goals along the way.
#2. Ashley Cole
The second best signing made by Jose has to be Ashley Cole in August 2006 from Arsenal who still to this day have never forgiven him. Throughout his time at the club, Ashley became one of the best left backs in the world.
#1. Didier Drogba
Taking the number one spot comfortably is probably one of Chelsea’s most successful signings in history. Notching over 150 goals throughout his time which saw three Premiership titles, four FA Cups and a Champions League victory. The Ivory Coast international was signed for $35 million from Marseille back in 2004, and left Chelsea this season.