Van Persie says Ferguson is similar to Holland coach Louis van Gaal.
He remarked: "The coach is one of the friendliest people I have ever come across in my life.
"Of course Ferguson has another side, when he is in the game mode. Then he is a warrior just like us, the players on the field.
"[Holland manager] Louis Van Gaal is the same. People base their opinions on what they see on TV of him. That is 20 per cent of the reality. I get it, it is human to judge that way, but for good judgment you need more information."