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Onana played for Ajax for 7 seasons, from 2015 to 2022. He made his debut for the club in 2015 and went on to play a total of 203 games for the club. He won the Eredivisie title with Ajax in 2019 and 2021, and the KNVB Cup in 2019. He was also named the Eredivisie Goalkeeper of the Year in 2019.