[2] Volkman is a Cabramatta Rugby Leagues junior, and signed with the Sydney Roosters in 2021.

[3] In May 2022, he was released mid season by the Roosters and signed with the New Zealand Warriors on a three-year deal.

[4] Volkman made his first grade debut in round 15 of the 2022 NRL season in his side's 40–6 loss to the Penrith Panthers at Dolphin Stadium.

[5] On 4 January 2024, Volkman signed a one-year deal to join St. George Illawarra, but failed a routine medical exam due to a shoulder injury that required surgery before the contract could be registered with the NRL.

[10] On 5 December, the Eels announced that Volkman had signed a deal to join the team after he had passed a medical on his shoulder.