On 24 February 2020, Antoñín signed for La Liga club Granada CF until June 2024. He made his debut on 5 March in the second leg of the Copa del Rey semi-finals, replacing Carlos Neva for the last five minutes of a 2–1 win (elimination on the away goals rule). Following the resumption of the season after the COVID-19 break, he made his top tier debut on 12 June again from the bench in a win by the same score at home to Getafe CF; on 1 July he scored for the first time to open a 2–0 win at Deportivo Alavés, a match in which he was substituted at half time due to a yellow card.