According to reporter Chris Wheatley, 15-year-old Gunners' young player Max Dowman was selected for the Champions League against Athletic Bilbao. Dowman only turned 16 at the end of this year, which also means that he is likely to break the youngest appearance record in the Champions League history.
According to official statistics from the Champions League, the current record is that of Mukoko, who previously played for Dortmund. At that time, Mukoko made his debut in the Champions League at the age of 16 and 18 days in 2020, and still maintains the record of the youngest player in the Champions League history.
After Mukoko, Yamal ranked second with 16 years and 68 days, Nigerian left-back Babayaro ranked third with 16 years and 86 days, Serki (16 years and 102 days), Croatian player Khalilovic (16 years and 128 days), and Tilemans (16 years and 148 days) ranked sixth.