Isak made his first team debut on 28 February 2016, coming on in the 75th minute of the Swedish Cup away match against fourth tier side Tenhults IF at the age of 16, scoring one goal in the 6--0 victory.
Isak made his first team debut on 28 February 2016, coming on as a substitute in the 75th minute of the Swedish Cup away match against fourth tier side Tenhults IF. At the age of 16, Isak scored one goal in the 6--0 victory.