Ferguson, whose infamous temper was essential during his glittering 26-and-a-half-years at Old Trafford, was at a Uefa Coach Education Workshop in Budapest.
The Scot could reveal more on his masterful management in his forthcoming autobiography released next week, but revealed he had to adapt his management and curb his anger at United.
"The human beings I've dealt with are far more fragile than the human beings of 30 years ago," Ferguson insisted. "And I say that in a good sense because they're coming from better conditions. I couldn't lose my temper the way I did back then with people nowadays!
"Also, which has become very dominant in the English game is the culture of players from different countries - at United I think there are people from 20 different nationalities and that's a challenge because people from different cultures have to be addressed and you have to make sure that they are comfortable in their environment because it's a results industry and you need to get the best out of them."
On Monday, Ferguson will receive the Freedom of the Borough of Trafford. Water's Reach, adjacent to Old Trafford, will be renamed "Sir Alex Ferguson Way".