[2] His mother is Australian television presenter and model Jo Silvagni, and he has two younger brothers, Ben and Tom.

[6] In the 2017 season, Silvagni received the AFL Rising Star nomination for round 13 following his performance against the Gold Coast Suns in which he kicked two crucial last-quarter goals, helping his side to a ten-point win.

[9][10] Jack moved back to his drafted position as a third tall forward during the 2019 AFL Season, where he was occasionally used as a utility player, providing an option further afield rather than an inside-50 marking target.

The year 2020 was a highly interrupted one for Jack, sustaining a bruised lung and fractured rib during a win against Essendon Football Club,[11] for which Essendon midfielder Zach Merrett received a one-match ban after the Match Review Officer reviewed the game and charged Merrett with striking.

[12] Compounding his injury woes, Jack went under the knife in August to have a small ITB (Iliotibial band) release procedure.