[5] He contacted Swedish personnel in MLS, including New York Red Bulls coach Hans Backe and former Sounders midfielder Erik Friberg, about the league prior to signing,[6] and joined the team in Arizona for training in January 2012.

[10] He didn't regularly start games until July due to a hamstring injury,[11][12] when he provided 2 assists in a 2–2 draw against the New York Red Bulls.

[15] Johansson played all 4 games in the MLS Cup playoffs, conceding a penalty against the Los Angeles Galaxy for a handball on Robbie Keane in a 2–1 win in the Conference Final, which the Sounders lost 4–2 on aggregate.

[18] Johansson previously played in the Swedish national under-21 team for 3 years before making his senior debut as left back on 24 January 2009 in a 3–2 loss to United States at the Home Depot Center, tripping Marvell Wynne to concede a penalty in the 40th minute.

[36] Johansson was called up to appear in the 2013 King's Cup in Thailand and played in a 1–1 semifinal draw with North Korea,[37] as won on penalties,[38] and the 3–0 win over Finland in the final on 26 January.

[37] Adam Johansson studied political science, economics, history, and international relations at the University of Gothenburg in Sweden before beginning his professional soccer career.