Jokiharju was selected 29th overall by the Chicago Blackhawks in the first round of the 2017 NHL entry draft.

In his draft eligible year, 2016–17, Jokiharju went to play for the Portland Winterhawks of the Western Hockey League (WHL).

[5] In his second game, Jokiharju recorded his first NHL point with an assist on captain Jonathan Toews' goal in a 5–4 overtime win over the St. Louis Blues.

[6] On 9 July 2019, Jokiharju was traded by the Blackhawks to the Buffalo Sabres in exchange for fellow first-rounder, Alexander Nylander.

This biographical article relating to a Finnish ice hockey defenceman is a stub.