Azpilicueta signed a new deal in December 2018, lasting to 2022. After Cahill left Chelsea, he was named club captain ahead of the 2019–20 season; he had already worn the armband on the pitch while the Englishman was out of the team, including in the 2019 UEFA Europa League Final victory against Arsenal in Azerbaijan. On 23 October, he marked his 350th Chelsea appearance with a 1–0 group stage away win against Ajax in the Champions League.