Career
Larsson was drafted in the second round as 56th overall by the Minnesota Wild of the National Hockey League (National Hockey League) in the 2010 National Hockey League Entry Draft. The same year, Larsson was also drafted in the fifth round of the 2010 KHL Junior Draft, as 111th overall, by the Metallurg Novokuznetsk. Larsson made his Elitserien (SHL) debut on September 16, 2010, against Modo Hockey.
A week later, on September 23, against Djurgårdens IF, he recorded his first Elitserien point, being the second assist in a goal, tying the game 2–2.
His first Elitserien goal was scored on January 15, 2011, against goaltender Joacim Eriksson of Skellefteå AIK. On October 1, 2010, Larsson signed a two-year contract with Brynäs IF"s elite team, which expired after the 2011-2012 Elitserien season. On May 18, 2011, Larsson signed a three-year contract with the Minnesota Wild of the National Hockey League (National Hockey League), but was loaned to Brynäs for the 2011-2012 season.
With the intention to pursue his National Hockey League career, Larsson relocated to North America, and was directly assigned to the Wild"s AHL affiliate, the Houston Aeros, to begin the 2012-2013 season due to the lockout. Larsson was recalled to the Wild during the shortened season as an injury replacement and made his National Hockey League debut against the Detroit Red Wings on February 17, 2013.
On April 3, 2013, at the trade deadline, Larsson was acquired by the Buffalo Sabres along with goaltender Matt Hackett, a 1st round pick in 2013, and a 2nd round pick in 2014 from the Minnesota Wild in exchange for Jason Pominville and a 4th round pick in 2014.
Larsson has on several occasions participated in Sweden"s national teams, including the junior teams as well as the senior team In the 2010 World U18 Championships, Larsson and his Sweden were placed second after the United States, losing the final against them. On March 30, 2011, Larsson made his senior national team debut in an exhibition game against Latvia which ended 4–1 in Sweden"s favour.