Manchester United pair DJ Buffonge and Tyler Warren are trialling with Bolton Wanderers.
The two youngsters missed United's U23 clash with Reading as they featured in action for the Trotters on Monday night.
Defender Warren, 20, has been training with the Championship for the last few days as they consider signing him when his contract expires at the end of the season.
Warren has made an impact at youth level with United with his defensive versatility proving to be a key asset in his encouraging development.
Buffonge had been training with Derby County last week.