 In the same month, he marked his Champions League debut with a goal; the opener in a 1–2 loss to Shakhtar Donetsk in the first leg of the first round of knockout fixtures, becoming the youngest Turkish player ever to score in the Champions League.Ünder has represented the U18 and U19 levels of the Turkey national youth football team.He most recently was called up to the Turkey national under-21 football team.