The Ajeti twins started their youth football with Basel in 2005, at the same time as their elder brother moved to the club from Concordia.
Liga Promotion, the third tier of the Swiss Football League, but was often called to the first team, taking a place on their substitute bench.
Ajeti made his professional debut, coming in as a substitute, on 13 March 2014 in the 2013–14 UEFA Europa League Round of 16 home tie in St.
The championship was won for the sixth time in a row that season[7] and in the 2014–15 Swiss Cup they reached the final.
Basel entered the Champions League in the group stage and reached the knockout phase as on 9 December 2014 they managed a 1–1 draw at Anfield against Liverpool.
Under trainer Paulo Sousa Ajeti totaled 16 appearances, 4 in the League, 2 in the Cup, as well 10 in test games.
[10] Ajeti made a solitary Bundesliga appearance for Augsburg, coming on as a 54th minute substitute in a 2–2 draw against Darmstadt on 12 March 2016.
[15] On 19 July 2019, in Ajeti's last Swiss Super League appearance for Basel, he scored the opening goal and assisted twice more in a 4–1 away win against Sion.
[16] On 8 August 2019, Ajeti joined West Ham United signing a four-year contract for a fee of £8 million.
[20] On 31 August 2022, Celtic sent Ajeti on a season-long loan with an option-to-buy to Austrian Bundesliga side Sturm Graz.
[22] On 4 September 2023, Süper Lig club Gaziantep announced the signing of Ajeti on a one-year contract with an option for a further year, for an undisclosed fee.
In August 2015 Albania's coach, Gianni de Biasi declared to the Swiss media that he plans to call Ajeti for the October 2015 qualifying matches of Euro 2016.
[26] Ajeti earned his first appearance for Switzerland on 8 September 2018, coming on as a substitute for Breel Embolo and scored his first goal in a 6–0 win against Iceland in the UEFA Nations League.