The Old Trafford boss marks a quarter of a century in charge of the Red Devils this weekend, a period which has seen him win an incredible 37 trophies.

Moyes, a fellow Scot, believes his good friend has set an unbreakable record.

"To stay 25 years at one club, especially one like Manchester United, is unbelievable," said the Everton manager.

"We are all saying '25 years' as though it is something very easy.

"To be at that club for that long and have the achievements he has had is something.

"It is something which I don't think will ever be done again."

Moyes said Ferguson's experience in the game was also a help to colleagues in need of advice.

"I think he has been a big influence on a lot of managers because if you need help you can pick up the phone," he added.