On 12 May 2021, UEFA named Spaniard Antonio Mateu Lahoz as the referee for the final. Mateu Lahoz had been a FIFA referee since 2011, and was previously the fourth official in the 2019 UEFA Champions League Final. He officiated six prior matches in the 2020–21 Champions League season, with one match in the play-off round, four in the group stage and one quarter-final leg. He served as a referee at the 2018 FIFA World Cup in Russia, and was selected as an official for UEFA Euro 2020. He was joined by six of his fellow countrymen, including assistant referees Pau Cebrián Devís and Roberto Díaz Pérez del Palomar. Carlos del Cerro Grande served as the fourth official, while Alejandro Hernández Hernández acted as the video assistant referee. Juan Martínez Munuera and Íñigo Prieto López de Cerain were appointed as assistant VAR officials, along with Polish referee Paweł Gil.