Chelsea boss AVB amazed by Ferguson's 25 years at Man Utd
He cannot imagine being at one club as long as Ferguson.
"A chance came around and I took it.
"But for any manager, a 25-year spell at one club is fantastic and shows a tremendous trust in Sir Alex's talent."
Fergie's fellow Scot and Blackburn boss Steve Kean said: "He had massive influence on me. His work ethic I've always admired. You always see him at reserve games."