He played college football at Minnesota, and was selected by the Tampa Bay Buccaneers in the fifth round of the 2020 NFL draft.

[2][3] As a true freshman at Minnesota in 2016, Johnson played in all 13 games with one start and had 14 receptions for 141 yards and one touchdown.

[7][8] In his senior season, Johnson caught 86 passes for 1,318 yards and 13 touchdowns, all of which led the Big Ten and set new single-season school records.

[14] In Week 5 of the 2020 season, he recorded his first four career receptions for 61 receiving yards in the 20–19 loss to the Chicago Bears.

[15] In Week 6 against the Green Bay Packers, he scored his first professional receiving touchdown on a seven-yard reception from Tom Brady.

[17] Johnson drew a critical, game-sealing pass-interference penalty on Packers cornerback Kevin King in the National Football Conference Championship game, which the Bucs won 31–26 to advance to Super Bowl LV, where they won 31–9 over the Kansas City Chiefs.