[4] It was speculated the Canucks drafted friend Elias Pettersson based partly on highly successful chemistry with Dahlén on the top line for Timrå IK, where they finished fifth and ninth in league scoring as teenagers.

[13] Dahlén attended Vancouver's 2018 training camp and played with the Canucks during the 2018–19 pre-season, before he was assigned back to the Utica Comets before the NHL season opener.

In early August 2019, unable to replicate his offensive success from Sweden in North America, Dahlén signed to return to Timrå IK of the Allsvenskan on loan from the San Jose Sharks.

He registered 5 points in the opening qualification game before Timrå's quest for promotion to the SHL was halted due to the COVID-19 pandemic.

He was named as the Allsvenskan's forward of the year and Most Valuable Player for the second season in succession, and finished as the playoff MVP, by registering 22 points through 15 post-season games to help Timrå IK claim the championship and gain promotion to the SHL.

In the 2022 offseason, after not being tendered a qualifying offer to remain with the Sharks, he returned to his native Sweden in re-joining Timrå IK on a five-year contract on 31 August 2022.