Moyes gave his first media conference as United manager.
He said: "It is impossible to match Sir Alex and do it for 26 years, at this level.
"I don't think there will be another manager who will do it for that long but I hope he is sitting in the directors' box because he has been so good and I have already called him two or three times for some advice.
"Sir Alex will never go away. His name is on the stand and there is a statue of him but he's not there to pressure me.
"There were some brilliant managers who could have quite easily taken this role but the biggest confidence boost I got was that Sir Alex said to me 'You're the next Manchester United manager'."