Sulejmani made his first appearance for the seniors in the 2005–06 season, aged 17, and quickly drew interest from Dutch clubs AZ Alkmaar, FC Groningen and SC Heerenveen; additionally, he also spent time at farm team FK Teleoptik.

[3] Sulejmani netted ten official goals in his first year with Ajax, including two in seven contests in the campaign's UEFA Cup as the club reached the round-of-16.

[4] On 11 August 2010, West Ham United confirmed that they had agreed terms with Ajax and Sulejmani to take him on a year-long loan subject to the granting of a work permit,[5] which was denied the following day.

[6] He continued to display solidly in the following two seasons, scoring 19 goals in 54 appearances combined en route to back-to-back national championships.

Benfica as a free agent;[8][9][10] after this was confirmed, coach Frank de Boer demoted him to the reserves, where he remained until the end of his tenure.

[11] Several days after the initial reports of the deal with Benfica appeared, it was finally confirmed that Sulejmani, along with countryman Filip Đuričić, passed medical tests and agreed to a five-year contract effective as of July 2013.

[14] Sulejmani made his Primeira Liga debut on 25 August, coming in midway through the second half of a 2–1 home win against Gil Vicente FC.

[20] Sulejmani's father Miljaim is an ethnic Gorani whose family moved from Gora in southern Kosovo to Batajnica neighbourhood of Belgrade in 1948.