[1] On 3 April 2016, he made his debut in a 1–0 home win against Syrianska FC, after coming on as a substitute in the 81st minute in place of Oliver Stojanović-Fredin.

[5] On 15 April the same year, he made his debut in a 0–1 home defeat against Skövde AIK, after coming on as a substitute in the 75th minute in place of Mohamed Ramadan.

[12][13] The transfer fee was reportedly set at around 7-8 million Swedish kronor, making Selmani the most expensive acquisition in Hammarby's history.

[15][16] On 20 February 2021, he made his competitive debut for the club in a group stage match in Svenska Cupen, the main domestic cup, against AFC Eskilstuna after being named in the starting line-up and provided one assist and scored his side's second goal in a 4–1 home win.

[23] Selmani featured in the final of the 2021–22 Svenska Cupen, in which Hammarby lost by 4–5 on penalties to Malmö FF after the game ended in a 0–0 draw.

[27] His debut with Hapoel Be'er Sheva came three days later in the 2022–23 UEFA Europa Conference League second qualifying round against Dinamo Minsk after coming on as a substitute at 58th minute in place of Sagiv Yehezkel.

[38] On 17 March 2021, the Football Federation of Kosovo announced that Selmani had decided to represent their national team,[39][40] and was planned to get called up to the 2022 FIFA World Cup qualification matches against Sweden and Spain, but was ultimately left out of the squad due to testing positive for COVID-19.

[39][40] Selmani was also called-up by Kosovo to the matches in June and September 2021, but due to the lack of a passport he was forced to stay as a unused substitute.

[41] His debut with Kosovo came on 9 October 2021 in the 2022 FIFA World Cup qualification match against Sweden after coming on as a substitute in the 70th minute in place of Zymer Bytyqi.