On 4 January 2015, Zouma scored the third goal for Chelsea in the 3–0 victory over Watford in the FA Cup. Six days later, he started in the Premier League for the first time, partnering John Terry in place of Gary Cahill and keeping a clean sheet in a 2–0 home win over Newcastle United, which put Chelsea back into first place in the league table. With Nemanja Matić suspended and Mikel John Obi injured, Zouma played in defensive midfield as Chelsea won the League Cup Final on 1 March after a 2–0 victory over Tottenham Hotspur. On 3 May, he featured as a substitute for the final five minutes in place of Willian as Chelsea defeated Crystal Palace 1–0 to win the league title.