Lekkerimäki made his professional debut for Djurgårdens IF during the 2021–22 season, where he recorded seven goals and two assists in 26 games.
This made Lekkerimäki the second most-productive 17-year-old goal-scorer in SHL history after Peter Forsberg, who had seven goals in 23 games.
[4] In order to continue his progress in development, Lekkerimäki left Djurgårdens and signed a two-year contract with SHL club, Örebro HK, on loan from the Canucks on 16 May 2023.
[11] Lekkerimäki represented Sweden at the 2022 IIHF World U18 Championships where he led the tournament in scoring with five goals and ten assists in six games and won a gold medal.
[1] Lekkerimäki represented Sweden at the 2024 World Junior Ice Hockey Championships where he led the team in scoring and recorded seven goals and three assists in seven games and won a silver medal.