Reports have claimed Fergie may decide to step down after next season.
He said: “David hasn’t got the credit he deserves.
“When you take everything into consideration, he’s done an incredible job at Everton.
“He has not had the resources of other clubs but got all his younger players on long contracts and built around them with the likes of Phil Jagielka, Tim Cahill and Joleon Lescott.
“The signings he has made have been terrific and it means he has continuity for years.”
Inter Milan boss Jose Mourinho and Aston Villa manager Martin O’Neill have also been linked with the job.