On 3 June 2018, Umtiti signed a new five-year contract with Barcelona. The release clause was subsequently set at €500 million. Umtiti was named as a substitute for the 2018 Supercopa de España behind Piqué and a new summer signing Clément Lenglet. Despite not featuring and with Barcelona winning the match 2–1 against Sevilla, Umtiti claimed his fifth winners' medal since joining the club.