"I think it is in the DNA of Manchester United that young players come through," he told Sky Sports.
"I think about the Busby Babes, the Class of '92, and also we've worked hard to get this generation built in an environment that they are really competitive every day, to bring them through and when they get an opportunity to take them.
"Kobbie Mainoo is one of them. We, as Manchester United coaches, are very happy that a player of his skills is coming through.
"We have more young players like Garnacho, like Hojlund, like Omari Forson, like (Amad) Diallo. Antony is also young," the 54-year-old added.
"We have many good, young players and we have to develop their skillset, being in the team feeling a stronger connection with Manchester United, a real winning attitude. That is a base to winning trophies."