On 25 August, ahead of their first Carabao Cup match of the season, Arsenal announced that Uruguayan midfielder Lucas Torreira would once again go out on loan, this time to Serie A team ACF Fiorentina for the entire 2021–22 season. Torreira had spent the entirety of last season on loan at La Liga team Atlético Madrid, accumulating 26 appearances one goal in all competitions; Atlético Madrid went on to win the league.