The Netherlands Head Coach believes Van Persie is itching to get back to his best in Brazil after a frustrating and injury-hit season at Old Trafford.
The Manchester United marksman, who was Europe’s leading scorer in qualifying, missed six weeks towards the end of the Premier League season with a knee injury, returning only for their last three Premier League games after Moyes had been sacked.
Van Gaal, though, has revealed it was the Scot who allowed Van Persie to travel to his homeland for a special boot-camp designed specifically to improve his fitness. The result has left the striker well on the way back towards peak fitness as he prepares to lead the line for his country in the World Cup.
Van Gaal said: “He is coming out of injury, you know that. We built him already up in our federation, our medical department.
“It was under the permission of David Moyes. So we could control him. He has worked very hard. Then he played two matches of 20 or 30 minutes and the last match 30 minutes.
“We did not expect that as the injury was bad. It was not so light. De Guzman [who suffered a hamstring injury in training on Monday] was much lighter I think.
“Van Persie had a heavy injury. So I think of course he is not 100% fit. He is not 100% fit. But he can play.”
The 30-year-old scored 12 goals in just 21 league appearances throughout the course of the season. He endured a troublesome time under Moyes, leading many to suggest he could quit the club after only one full season.
However, with Van Gaal preparing to take the helm at Old Trafford, he now looks set to stay. Van Persie has firmly established himself as the centre-piece of the 62-year-old’s national side and this is likely to be the case upon the manager's arrival in Manchester.
Since returning to action for the Netherlands, he has scored in friendlies against Ecuador and Ghana. His injury recovery is clearly going to plan, and with two goals in as many games, he looks in fine form.