Larsson moved to the United States in 2020 to play for the
Utah Utes. He announced a transfer to
Arizona following his only season at Utah. In his first season at Arizona, 2021–22, Larsson was named the Pac-12 Sixth Man of the Year and appeared in all 37 games, averaging 7.2 points, 3.4 rebounds and 1.8 assists per game. He played in all 35 games and had 18 starts in 2022–23, averaging 9.9 points and 4.3 rebounds per game. He initially entered the
2023 NBA draft but later announced he was returning to Arizona for his
senior year in 2023–24. ==Professional career==