United director Charlton insists Fergie, 71 and boss at Old Trafford for 26 years, isn't ready yet to retire.
When told there are claims Fergie will call it a day if he wins the league this season, Charlton said: "No, he wouldn't. It's absolutely right that he still has a hunger and desire which hasn't waned at all.
"I was part of a few people who brought him to Old Trafford.
"I was part of the process and I didn't worry at the time because I knew what we were bringing to the club.
"But I never thought he would still be with us so many years on.
"That is testament to the amazing success he has had. He is marvellous and he is not scared to share the love he has for the game with others. He's unbelievable really."