Acquired by the Blackhawks from the Florida Panthers on April 8, 2021, Borgström finished the regular season with 21 points (11G, 10A) in 30 games for HIFK in the Finnish Elite League. He added two goals and three assists in eight playoff games this year. A first-round pick (23rd overall) in the 2016 National Hockey League Draft, Borgström made his NHL debut on March 29, 2018 against the Ottawa Senators. He registered his first career NHL goal on April 8, 2018 vs. Boston. Spanning parts of three seasons (2017-2020), he played in 58 career regular-season games with the Panthers, recording nine goals and 10 helpers. The Helsinki, Finland native posted career highs in games played (50), goals (8), assists (10) and points (18) with the Panthers during the 2018-19 campaign.
The 23-year-old was selected to participate in the 2019 American Hockey League All-Star game and finished the season with 22 points (5G, 17A) in 24 regular-season games. He played collegiately at the University of Denver during the 2016-17 and 2017-18 seasons, where he was teammates with defenseman Ian Mitchell during the 2017-18 campaign. Borgström was named the National Collegiate Hockey Conference Player of the Year in 2017-18 and was one of 10 finalists for the Hobey Baker Award, given annually to college hockey's best player. He led Denver and finished fourth in the NCAA in scoring with 52 points (23G, 29A). A 6-foot-3, 199-pound forward, Borgström helped Denver capture the 2017 National Championship and was named the NCHC Rookie of the year, finishing the season with 22 goals and 21 assists.