“Every club where I have been, I’ve struggled for the first three months,” said Van Gaal, speaking in Washington DC in a break from United’s US tour.
“After that, they [the players] know what I want – how I am as a human being and also a manager, because I am very direct.
“I say things as they are, so you have to adapt to that way of coaching. It’s not so easy.
"The way I train and coach is in the brains, not the legs. But the most important thing is they have to know why we do things. When they do, the footballer is not playing intuitively.
"A lot of players are playing intuitively and I want them to think and know why they do something. That process is difficult at first and in the first three months. It takes time.
“When we survive the first three months, it will be the same as for me as it was at Bayern Munich. At Bayern, after the first three months, we were sixth or seventh and we were third in our Champions League group.
"We had to win at Juventus and did – that was the turning point. Now
United have me, a new manager, so new chances for the players. But we have to create a way of playing that isn’t the same as before, and that’s difficult for them.
“They have to perform under pressure and have a to decide [what to do with the ball] within one second, and that is not easy.”
Bayern won the German Double and reached the Champions League final in Van Gaal’s first season in charge, despite that sluggish start, and continue to thrive with the system he put in place.
But he faces a much tougher task at United, reviving a squad that finished 22 points behind champions Manchester City and missed out on the Champions League for the first time in 19 years.
Van Gaal is confident his players can adapt to a formation with three central defenders in a 3-4-1-2 line-up, despite his admission it will take time for it to work effectively.
And he is determined to leave a legacy, despite having a three-year contract, in contrast to Moyes’s six-year deal.
“I’m not a coach who thinks short-term,” he said. “I’m a coach who thinks always in the long-term.”