At a young age, Gustafsson caught the attention of the hockey community in his native Sweden.
By the 2010-11 season, Gustafsson was a full-time junior player at age 18 with Djurgardens. Starting the 2011-12 season in juniors, Gustafsson had three goals and 14 points in 21 games before moving up to Djurgardens' Swedish Elite League team, where he had three goals and seven points in 41 games.
At a young age, Gustafsson caught the attention of the hockey community in his native Sweden.
By the 2010-11 season, Gustafsson was a full-time junior player at age 18 with Djurgardens. Starting the 2011-12 season in juniors, Gustafsson had three goals and 14 points in 21 games before moving up to Djurgardens' Swedish Elite League team, where he had three goals and seven points in 41 games.
The Edmonton Oilers selected Gustafsson in the fourth round (No. 93) in the 2012 NHL Draft.
He led Djurgardens defensemen with seven goals, 16 assists and 23 points in 2012-13, when the team was in the Allsvenskan (Swedish second division). He returned to the SEL in 2013-14 with Frolunda and led the club's defensemen with 18 assists. The next season he was third among league defensemen in assists (25) and fifth in points (29).
The Chicago Blackhawks signed Gustafsson as a free agent on April 30, 2015, and he split his first North American pro season between Chicago and Rockford of the American Hockey League. He made his NHL debut Oct. 30, 2015, against the Minnesota Wild, getting an assist for his first NHL point. Gustafsson finished with 14 assists in 41 games and had his first multipoint NHL game when he got two assists April 1, 2016, against the Winnipeg Jets.
Gustafsson made his Stanley Cup Playoff debut April 13, 2016, in Game 1 of Chicago's first-round series against the St. Louis Blues. He got his first NHL playoff point with an assist six days later in Game 4.
