Charlie Savage trained with Manchester United's first-team at Carrington again on Saturday afternoon.
Savage started for United's U21s against West Ham in the Premier League 2 on Friday and the Manchester Evening News understands he was substituted at half-time during that match because he was set to train with Erik ten Hag's first-team.
The 19-year-old travelled on United's pre-season tour of Thailand and Australia this summer and he impressed Ten Hag with his mature performances. Savage was the breakout youngster on that tour alongside fellow midfielder Zidane Iqbal.