[2][3][4] On January 3, 2013, Johnson signed a Generation Adidas contract with Major League Soccer, making him eligible for the 2013 MLS SuperDraft.
[6] On March 13, Johnson made his Dynamo debut, coming off the bench in a 3–0 loss to Santos Laguna in leg 2 of the 2012–13 CONCACAF Champions League quarterfinals.
[9] Johnson made one substitute appearance in the playoffs for the Dynamo, coming off the bench in a 2–1 loss to Sporting Kansas City in leg 2 of the Eastern Conference Finals.
[9] He also spent part of the season on loan to USL side Pittsburgh Riverhounds, where he made 12 appearances, scored 1 goal, and had 1 assist.
[12] Johnson made his Fire debut on May 9, 2015, when he entered as an 84th minute sub in a 2–1 loss against visiting Real Salt Lake.
On July 11, Johnson scored 2 minutes into stoppage time to give Chicago a 1–1 victory against Seattle Sounders FC.
[15] On April 3, Johnson scored twice in his San Antonio debut to help defeat Seattle Sounders FC 2 3–0.
[7] He made 27 appearances and scored 3 goals during the USL regular season as San Antonio finished 11th in the Western Conference, failing to qualify for the playoffs.
[10][16] On November 15, 2016, Johnson reunited with manager Frank Yallop, who was his coach in Chicago, at Phoenix Rising FC for the 2017 season.
[26] In the playoffs, Johnson made 2 substitute appearances and had 1 assist as Louisville reached the conference finals, where they lost 2–1 to the Tampa Bay Rowdies.
[7] Source:[39] Phoenix Rising Johnson holds a U.S. green card which qualifies him as a domestic player for MLS roster purposes.