İlyasova stepped up to the Turkish Basketball League for the 2004–05 season with Ülkerspor, averaging 4.5 points and 3.2 rebounds in eleven games.

[7] On 3 August 2011, İlyasova signed with Anadolu Efes of the Turkish Basketball League for the duration of the NBA lockout.

[15] On 27 October he made his debut for the Pistons in a 106–94 win over the Atlanta Hawks, recording 16 points, seven rebounds, three assists and one block in 34 minutes.

[17] The next day, he made his debut with the Magic in a 110–104 win over the Dallas Mavericks, recording 16 points, five rebounds, two assists and one steal in 23 minutes.

[18] On 23 June 2016, İlyasova was traded, along with Victor Oladipo and the draft rights to Domantas Sabonis, to the Oklahoma City Thunder in exchange for Serge Ibaka.

[20] He made his debut for the 76ers the next day, scoring an equal team-high 14 points on 5-of-12 shooting in a 109–93 loss to the Charlotte Hornets.

[32] On 17 April, İlyasova logged a season-high 20 points on 7-of-11 field goal shooting and 6-of-8 from three, in addition to five rebounds, four steals and two blocks across 31 minutes in a 115–127 overtime loss to the Los Angeles Lakers.

[35] İlyasova entered the NBA's health and safety protocols on December 28, and did not play for the team before his contract expired.

[40] Since the 2003 Turkish Junior Basketball Championship held in Konya, there has been some controversy to İlyasova's age and national origin.

[41] The controversy is fueled by the claim that a man named Arsen Ilyasov, born in 1984 in Bukhara, Uzbekistan, entered Turkey as an 18-year-old on 7 August 2002 and was never heard from again, while on 19 September 2002, a man named Semsettin Bulut claimed to have forgotten to register the birth of his now 15-year-old son, and did so as Ersan İlyasova, a Turkish citizen.

[39] While this controversy was brewing, ESPN's Chad Ford referred to Ilyasova as "The 17-year-old forward from Uzbekistan is widely considered the best prospect to ever come out of Turkey.