During his near-on 23-years as boss at Old Trafford the 68-year-old has won 11 Premier League titles, five FA Cups, three League Cups and two Champions League crowns but he insists he still hungry for more silverware.
"When you manage this club there is an expectation every day," the United manager has told the Manchester Evening News.
"It keeps you on your toes. There is an easy motivation here.
"There is the expectation of the club and the players you have to deal with.
"There are some terrific players here. Then it becomes part of the process. It is easy to buy into.
"That makes it very easy to keep the motivation all the time."