[2] Casali was selected to represent Italy at the inaugural Junior World Championships alongside Lorenzo Bonicelli and Ivan Brunello.

Casali made his senior international debut at the 2021 European Championships; during qualifications he placed fourteenth in the all-around but did not qualify to the final due to compatriots Nicola Bartolini and Stefano Patron ranking higher.

[8] Later that year Casali was selected to represent Italy at his first World Championships alongside Yumin Abbadini, Nicola Bartolini, Carlo Macchini, and Matteo Levantesi.

[10] Casali competed at the 2023 European Championships alongside Yumin Abbadini, Matteo Levantesi, Marco Lodadio, and Mario Macchiati.

[15] That same weekend he was selected to represent Italy at the 2024 Olympic Games alongside Yumin Abbadini, Nicola Bartolini, Mario Macchiati, and Carlo Macchini.