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Nwaneri came off the bench late on as the Gunners returned to the top of the table with a 3-0 win at Brentford.
He broke the record previously held by Liverpool's Harvey Elliott when he appeared for Fulham aged 16 years and 30 days. Nwaneri also set a new landmark for the youngest Arsenal player in any competition that was held by Cesc Fabregas.
Nwaneri had been expected to spend the season with Arsenal Under-18s but he was quickly promoted to the Under-21s following his impressive performances.
Injuries to captain Martin Odegaard and Oleksandr Zinchenko had left Arsenal boss Mikel Arteta short of midfield options. "We are pretty short and opportunities come when issues arise," said Arteta. "We have the opportunities to bring young players on."
