"I was irritated [when left out of the side] but I always recognised he was the best football-wise, for the concepts he has and how he imposes them on a team," he told reporters.
"He has shown that in this World Cup. But I didn't leave because of him, but because of my own decision.
"For example, he'd get in front of the squad and say who was the best or worst at doing different things.
"He has a real determination in thinking about the team and potential consequences. I learned a lot from Van Gaal."
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