The Red Devils' retiring managerial legend has warned his successor about the sheer size of the club he is moving to and the consequent challenge he is taking on at Old Trafford
Moyes, who has been touted as Sir Alex's replacement for years, was last week confirmed as the man who will be taking over at Old Trafford next season.
"He's got a good squad of players and he will want to add to that, I'm sure, himself. He will have his own ideas and that's good," Ferguson told The Guardian.
"The priority is the football team. Without the football team, they would not have all the sponsorships. The team is the priority – we all know that here. There is no doubt about that."
When asked whether Moyes could be in charge of the Red Devils for 15 years, the outgoing boss said: "Well, I hope so. I think it is the one club who could do that, you know, by showing great loyalty to their manager."
Following the recent dismissal of Roberto Mancini by United's cross-town rivals Manchester City, Ferguson was asked whether this would make Moyes' job any easier.
He replied: "It is quite amazing. He has won the [FA] Cup, been in the final, second in the league and won the league and it's not good enough?
"I was surprised but actually no, you can't say you are surprised, not with some owners today. You can't be surprised but I still don't think it was right.
"What happens at Man City won't have any bearing on David. He's got the structure here, he's got the experience, he's had to handle things at Everton that are more difficult probably. I don't think that [City's managerial changes] matters."