Manchester United boss Louis van Gaal won't guarantee sticking with 4-4-2 for their trip to Leicester City today.
United thumped QPR 4-0 using the system.
Van Gaal said: "I started with another system because of the quality of the players. Now we have bought quality players in and so you have to look at these qualities and then want to perform the philosophy that we have. Then you are coming out in this system, but that can change also. It is not a fixed solution.
"I have played that already in my first match at Ajax, where it was a law that we played 4-3-3. But I played 4-4-2 as trainer-coach of the second team because I saw it was more suitable for the quality of my players. That was 1998, a long time ago."
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