Martin Ødegaard in his Real Madrid debut against Bilbao Athletic. Photo: Javier Lizon / EFE / NTB scanpix
The 16-year-old midfielder would have been the youngest player ever to play in the European competition if he had been fielded for the match on Wednesday.
Europe's top clubs competed vigorously to sign Ødegaard this winter before the Norway international finally signed for Real Madrid in January. The Spanish club has always stressed that the 16-year-old would initially play mainly for the reserve team.
Nigerian defender Celestine Babayaro took the record for the youngest player ever to play in the Champions League when he played for Belgium's Anderlecht against Steaua Bucharest in 1994.
He was 16 years and 87 days old when he played, giving Ødegaard, who is 16 years two months and one day old, less than a month to scoop the record.