On 2 August 2015, Cahill made his first appearance of the season in Chelsea's 1–0 defeat at Wembley Stadium in the 2015 FA Community Shield against London rivals Arsenal. On 24 October 2015, Cahill scored his first goal of the season against West Ham United in a 2–1 defeat as Chelsea suffered their fifth defeat in ten matches. On 2 December 2015, Cahill signed a new four-year deal at Chelsea, keeping him at the club until 2019.