He played in 26 games during his U Sports career, recording 83 receptions for 1,032 yards and seven touchdowns.

[2][3] The 2020 CFL season was later cancelled due to the COVID-19 pandemic in Canada, so he did not sign with the Stampeders until January 21, 2021.

[4] He dressed in 13 games in 2021, recording seven special teams tackles and one forced fumble.

[5] Middlemost dressed for 16 games in 2022, catching five passes for 44 yards and totalling nine special teams tackles.

[1][7] Middlemost signed with the Edmonton Elks in free agency on February 11, 2025.