Sir Alex Ferguson believes that players in the modern game are not sufficiently prepared to become top-flight managers, especially given the excessive demands of new owners, as reported by ESPN.
The former Manchester United boss knows a thing or two about succeeding in the management game and believes players need to start focusing on what they will do after their career much earlier.
The wealth of British managers available at the top level seems to be shrinking all the time and Ferguson believes something needs to change in a player's mindset as they approach their final few years.
"Today I think a lot of players don't make their mind up that they want to stay in the game until it's too late. In other words, they don't have a rounded preparation like I did. They maybe take their badges at 32, 33 and then they expect to managers two or three years later.
"It's a result industry. It's a serious result industry. You have to win games. And if you don't have the proper preparation like I did, and a lot of coaches did, you're going to suffer.
"It's a very, very difficult industry. And of course the other side, as opposed to when I started, was that you have different owners. They have owners from all over the world, with different ambitions -- there's a lack of patience in that respect. But you really need to be prepared to stay in the game. That's the most important message I could give them all."
Ferguson helped establish an unparalleled domestic dynasty at United, while also winning the Champions League twice, and he believes that English football will reign supreme again despite the clear lack of talent and British managers.
He said: "I think success is cyclical. If you think about the '90s, it was AC Milan. In the '70s, Ajax; and Bayern Munich in the '80s; Liverpool, in the '90s; Italy, AC Milan; then England had a great spell with three teams about six years ago all in the semi-final. We (United) were in three finals in four years.
"(Now) the domain is in Spain. There's no question about that. The same question could be asked about the German teams, why are Bayern Munich not winning the Champions League? Why are the Italians not winning it? Why are the French not winning it?"