The 2015–16 season was Chelsea's 102nd competitive season, 26th consecutive season in the top flight of English football, 24th consecutive season in the Premier League, and 110th year in existence as a football club. They entered this season as reigning champions after winning the league for a fifth time the previous season, and also participated in the FA Cup, League Cup, Community Shield and the UEFA Champions League. The season covers the period from 1 July 2015 to 30 June 2016.

Left-winger Gaël Kakuta leaves the Blues to join La Liga side Sevilla, for a fee of £2.5 million.Goalkeeper Petr Čech leaves the club to join London rivals Arsenal on a three-year deal. The legendary Czech played 486 games for the Blues in all competitions winning four Premier League medals, four FA Cup medals, three League Cup medals and one UEFA Champions League medal.

Petr Čech starred in the 2012 UEFA Champions League Final, saving an extra time penalty from Arjen Robben as well as two penalties in the penalty shoot out and was subsequently named Fans' Man of the Match. While at the Blues, Čech holds a number of goalkeeping records, including the Premier League record for fewest appearances required to reach 100 clean sheets, having done so in 180 league appearances. During the 2004–05 season, Čech went 1,025 minutes without conceding a goal – a Premier League record, until it was surpassed by Edwin van der Sar of Manchester United. He won the Golden Glove three times; in the 2004–05, 2009–10 and 2013–14 as the Premier League goalkeeper with the most clean sheets. Čech kept a club record 220 clean sheets for Chelsea in all competitions.

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