On 24 March 2014, following one season of NCAA play with Colorado College, the Minnesota Wild of the National Hockey League (NHL) signed Olofsson to a three-year entry-level contract starting with the 2014–15 season,[1] but was immediately assigned to begin his professional career with the Iowa Wild in the American Hockey League (AHL).

[2] Olofsson was called up to the NHL for the first time on November 19, 2015,[3] where he subsequently made his debut that night in a 4–2 loss to the Boston Bruins.

[5] On October 3, 2018, Olofsson was traded to the Montreal Canadiens in exchange for prospect William Bitten.

[6] Oloffson spent three seasons within the Canadiens organization, before leaving as a free agent to sign a one-year, two-way contract with expansion club, the Seattle Kraken, on 25 August 2021.

[7] Olofsson played with Sweden at the 2014 World Junior Ice Hockey Championships where he was his team's top scoring defenseman.