[3] Following 2018 training camp, he was placed on the team's practice roster, but made his professional debut on September 8, 2018, against the Saskatchewan Roughriders in the Banjo Bowl, where he recorded three defensive tackles.

[2][3] He played in the team's next game against the Montreal Alouettes before returning to the practice roster and ultimately being released on October 16, 2018.

[3] He retired following training camp in 2019, but returned to the team on September 16, 2019, and spent one month on the practice roster before being released on October 21, 2019.

[4] Priester played for his hometown Tampa Bay Vipers in 2020, where he started five games and recorded seven tackles, one sack, and one interception.

[9] Following 2022 training camp, he made the active roster and became the starting cover linebacker while Chris Edwards served a three-game suspension.

[11] In 2023, Priester played in just five games, starting in one, where he had three defensive tackles, while spending most of the year on the injured list.