Louis van Gaal will continue with his new system for the rest of pre-season to give his Manchester United players as much time as possible to adapt before the new campaign begins.
Van Gaal has deployed a 3-5-2 formation in both games on tour so far, against LA Galaxy and Roma, albeit with almost completely different personnel in each of the four halves.
The manager has pointed out that he has other options but wants to stick with his preferred shape against Inter Milan on Tuesday and Real Madrid on Saturday.
"It’s difficult to change the systems and I had to start this system at once because we don’t have time to change it," van Gaal told media at a press conference in Washington DC.
"We only have three weeks before the season starts, so I have to use all my training sessions to implement this system.
"They know already the other system [4-4-2 or 4-3-3]; they have played that from their youth, so that’s easy. You saw that in the [Netherlands’] game against Mexico – I’m sorry to say that when we were 1-0 down I changed the system to 4-3-3 and then we beat them!"
Van Gaal confirmed Wilfried Zaha, who hasn’t yet seen any action in the States, will play up front in the second half of the International Champions Cup game against Inter.
"When we play this system, he has to play as a striker, otherwise he cannot play," said the boss. "Young is another winger but he can play as wing-back. We shall see."