Since joining Corinthians, Cássio has made over 500 appearances and won two Série A titles, four Campeonato Paulista titles, a CONMEBOL Libertadores title, a CONMEBOL Recopa Sudamericana title and a FIFA Club World Cup title against Chelsea in 2012. Cássio won the Golden Ball as Best Player of the 2012 FIFA Club World Cup and was elected as Most Valuable Player of the final. After the triumph of 2019 Campeonato Paulista, he became the player with most titles in club's history.