 Sema won the 2016–17 Svenska Cupen with Östersund, assisting three of their four goals in the final, and later played a major role in their 2017–18 UEFA Europa League campaign.On 22 February 2018, Sema scored a goal in a 2–1 win against Arsenal in the round of 32.Despite this, Östersund were eliminated from the Europa League after losing 2–4 on aggregate.