On 24 February 2019, during the 2019 EFL Cup Final against Manchester City, with the match at 0–0 near the end of extra time, Maurizio Sarri called for Arrizabalaga to be substituted off for Willy Caballero for the upcoming penalty shootout. Arrizabalaga refused to be substituted, gesticulating and remaining on the field. During the shootout, he saved one penalty as Chelsea lost 4–3. After the game, both Arrizabalaga and Sarri said that the situation was a misunderstanding, with Sarri incorrectly believing that Arrizabalaga was too injured with cramp to continue. Later on, Arrizabalaga met with Sarri and apologised to him and to the rest of the club. He was fined a week's worth of pay as a result of his actions, with Sarri leaving the decision of any further discipline up to the club. Arrizabalaga was dropped from the starting lineup for Caballero in Chelsea's next match, a Premier League game against Tottenham. He returned to the lineup for the following match.