The 2009–10 season was Chelsea Football Club's 95th competitive season, 18th consecutive season in the Premier League, 104th year in existence as a football club and the first season coached by Carlo Ancelotti. Despite disappointment in the Champions League, the club had the most successful season in its history, winning the Premier League for a third time and retaining the FA Cup for the first time, therefore becoming the seventh English club to complete the "Double".

Chelsea won the F.A. Cup and the English Premier League to complete the Double for the first time in their history, while breaking numerous Premier League records in the amount of goals they managed.

Supplier: Adidas / Sponsor: Samsung

The kit was first worn against Blackburn Rovers in the second-to-last Premier League game of the 2008–09 season. The away kit which was revealed at Chelsea's website on 25 June uses a tonal hoop design in dark navy and new navy with neon yellow highlights. The third kit is white with horizontal grey pin stripes and dark blue, almost black accents. They also wore the third kit with dark navy shorts. A new goalkeeper kit was brought in which was navy blue with fluro green accents. The fluro orange from the previous season stays on as the away goalkeeper shirt for this season. Chelsea will wear their 2010–11 home kit in the FA Cup final.

Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.

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