Ferguson supplied advice to retiring players and insisted they had to earn their chance in the top flight by first working in the lower leagues.
"Prepare to be a manager," he said. "It's no use finishing one day and being a manager the next.
"I'm dead against fast-tracking managers in the game. You're not doing yourselves any favours. Prepare, get your badges, work for years at lower levels and earn the right to be a manager."