5 players you didn't know played for Chelsea 

#2 Mateja Kezman (2004-2005)

Mateja Kezman underwhelmed in one year at Chelsea

After scoring goals for fun and winning numerous titles and individual accolades with PSV, Mateja Kezman completed a transfer to Chelsea in the summer of 2004. The former Serbian international had averaged almost a goal a game in the Eredivisie and big things were expected of him as the figurehead of the ambitious Chelsea but this largely failed to happen.

He did not get going in the Premier League, waiting until December to open his account and did not score again until March, with his total of seven goals from 41 matches in all competitions disappointing to say the least.

Kezman failed to step up to the plate at Chelsea and his career at Stamford Bridge is largely classified as a failure and even though he scored the winning goal in the final of the 2005 League Cup against Liverpool, nobody was really surprised when the club sold him to Atletico Madrid after just one season.

He won three Golden Boots in the Eredivisie but failed to find his scoring boots in the Premier League and in many ways, Kezman's dire display in England helped raise scepticism over goalscoring exploits in The Netherlands, with future top scorers like Wilfred Bony, Vincent Janssen, Memphis Depay, and Afonso Alves all failing to cut the grade in the Premier League.