On 5 July 2018, Ademi signed his first professional contract with Swiss Super League side Neuchâtel Xamax after agreeing to a one-year deal with the option of continuation for another year.

[1] After a month, he made his debut as professional footballer in a 3–0 away defeat against Sion after coming on as a substitute at 46th minute in place of Tunahan Cicek.

[4] He played his debut with in the team four days later in the 2019–20 UEFA Champions League second qualifying round against the Dutch side PSV Eindhoven in the Philips Stadion on 23 July 2019.

[10] One month after debut, Ademi scored his first goal for Fenerbahçe in his fourth appearance for the club in a 4–0 home win over Sivas Belediyespor.

[13] On 10 August 2021, Ademi signed a three-year contract with Russian Premier League club Khimki and received squad number 9.

[20] On 25 June 2020, the Swiss Football Association announced that FIFA accepted Ademi's request to play for Switzerland after staying in the country for almost fourteen years.