He became a regular starter with the Tiger-Cats in 2021 and scored his first career touchdown on a 23-yard catch from Dane Evans in the Labour Day Classic against the Toronto Argonauts on September 6, 2021.

[4] He also played in all three post-season games in 2021, including the 108th Grey Cup, where he had three kickoff returns for 42 yards in the loss to the Winnipeg Blue Bombers.

[4] In 2022, Ungerer played in 14 regular season games with seven starts where he had 16 catches for 225 yards and one touchdown.

[4] He also played in the team's East Final loss to the Montreal Alouettes where he had four catches for 35 yards.

[7][8] He also played and started in all three post-season games, including the 111th Grey Cup where he had four receptions for 29 yards in the Argonauts' 41–24 victory over the Winnipeg Blue Bombers.