Ferguson was asked about the qualities needed in an interview with L'Equipe.
"First, there is personality," he said. "He immediately needs to meet my demands, my expectations.
"These guys, they're in charge. They're never absent. Never late. At 39 and 38 years old! The values they embody, as a necessity, seep into those who sit next to them in the dressing-room. You can't fool these guys, or take them for idiots.
"We continue to coach young people, the ones that will become the next Giggs and Scholes. The key is coaching the player when they arrive. We have a team of teachers who have been at the club for more than 10 years.
"It's education, but also sharing values: there are lines not to cross. Sometimes we are faced with differences, but we don't have any serial killers here (laughs).
"We do not bury the stories, but they are dealt with internally.
"A good player is also a disciplined player."