[9] He attracted the attention from foreign scouts, including French Ligue 1 club Toulouse and Turkish giants Fenerbahçe,[10] after scoring 3 goals in 33 matches that season.
[11] On 31 July 2014, Durmisi made his UEFA Europa League debut, starting in the 3–0 away defeat against Belgian side Club Brugge.
[15] On 2 October 2015, after months of negotiations and after replacing his agent Sedat Duraki, Durmisi signed a contract extension which tied him to the club until the summer 2018.
[20] On 30 April 2018, he scored a goal for Betis as they secured Europa League qualification for the 2018-19 season following a 2-1 La Liga win over Malaga.
[26] On 6 December 2019, French club Nice announced that they reached an agreement with Lazio to loan Durmisi from January 2020 until the end of the 2019–20 season.
[27] After his debut on 5 January 2020 in a 2–0 win over Fréjus Saint-Raphaël in the Coupe de France,[28][29] Durmisi managed only to make five league appearances for the rest of the season, before returning to Lazio.
[30] He returned to Lazio ahead of the 2021–22 season, where he was not called up by new coach Maurizio Sarri for the second phase of the January training camp and consequently remained on the fringes of the squad.
[35] After spending six months as a free agent, on 8 January 2024 Durmisi signed a six-month contract with bottom-placed Ekstraklasa club ŁKS Łódź.
[39] On 8 June 2015, Durmisi made his senior international debut for Denmark in a 2–1 home friendly win against Montenegro at the Viborg Stadion, as a 72nd-minute substitute for Simon Poulsen.