Sir Alex Ferguson has suggested he will become a director at Manchester United when he retires, but reiterated he has no date in mind for when he will step down as manager.Ferguson also outlined one of the key tenets of his managerial philosophy, explaining: "Imagination is always important. The other most important thing is don't change who you are. "It happens, you see it time and time again, a manager comes in and tries to change himself. "Your job is not to change you, it's to change what you're taking over. Change the team, the philosophy of a football club to your philosophy. Never change who you are. "That really will hold you in good stead, simply because the players understand what you are, who you are."