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Lille was the club Onana played for before joining Everton. The Cameroonian goalkeeper spent five seasons with the French club, making over 200 appearances. During his time at Lille, Onana won the Ligue 1 title in 2021 and was named the league's Goalkeeper of the Year in 2020 and 2021. He also helped Lille reach the knockout stages of the Champions League in 2020.