Sacchi refuses to join the clamour to write off Mourinho despite another difficult campaign at United.
"Mourinho, Sarri and Guardiola are all three great coaches but they are different," he told the Daily Mail. "When Mourinho does not win, people begin to say he has an old-fashioned style, but it isn't true.
"He is a coach who prefers the result to the game, but he's great: a great leader, very good tactically, an extraordinary character as a whole. The others are more like teachers."