Olofsson was selected by the Sabres in the seventh round (181st overall) of the 2014 NHL Draft. He signed a two-year contract with the team in April of 2018 after finishing his third full SHL season with career highs in both goals (27) and points (43) for Frölunda, leading all SHL players in both goals and power-play goals (14). The Ornskoldsvik, Sweden native totaled 60 goals in 200 career SHL games from 2013-14 to 2017-18, converting on 15 percent of his 400 shots in Sweden's top professional league.