[1] Johnson made his debut for Toronto FC II on July 8, 2015, against the Pittsburgh Riverhounds as an academy call-up.

[2] He was called up to the Toronto FC squad on June 2, 2016, and made his debut in the Canadian Championship semi-finals.

Johnson played in the final 10 minutes of a 4–2 win against Montreal Impact after replacing Mo Babouli.

[9] On December 11, 2021, it was announced Johnson would join USL Championship side Colorado Springs Switchbacks ahead of their 2022 season.

[16] Johnson was named to the Canadian U-23 provisional roster for the 2020 CONCACAF Men's Olympic Qualifying Championship on February 26, 2020.