Nigel Clough says the Blades have been encouraged by how defender Harrison McGahey has acquitted himself to Sky Bet League One football so far this season.
The 18-year-old defender joined from Blackpool in the summer, having ended last term in the Tangerines team in the Championship and Clough has shown no hesitation in starting him in all five of United's league clashes in August.
The Blades boss believes McGahey is improving with every game and insists he is in the team on merit, remarking: "We were very keen to bring Harrison to the Club in the summer, because we saw a very good player in the making, but he is raw, inexperienced and will make mistakes.
"But at the same time he is developing and we see some real potential in him.
"What we have to remember is he is still very young, he isn't a replacement for Harry Maguire because Harry was very similar to Harrison when he first broke into the first-team in the Championship.
"If a youngster is to learn they have to play and probably make mistakes, but what we don't want to see is Harrison making the same mistake twice. Harry made mistakes and that made him the Premier League player he is today.
"Harrison is very lucky to have someone like Chris Morgan to work closely with and Morgs believes he will go on to be a very, very good defender and we are optimistic he will develop gradually as the season progresses.
"He has certainly worked hard for the opportunity to start the season and he hasn't let anyone down."