Frank de Boer is of the belief that Louis van Gaal requires time to become a success at Manchester United.
The Ajax boss knows the former Holland manager well after working under him as a player at both the Amsterdam giant and Barcelona so is well-versed to comment on his current situation at Old Trafford.
Van Gaal has come under criticism in his debut season in England after spending more than £150million in the summer but de Boer is confident he will eventually bring joy to the famous club.
"Van Gaal wasn't a factor in my choice to join Barcelona, although my relationship with him was very good. It still is, actually," de Boer said in the April 2015 edition of FourFourTwo magazine.
"I think he'll be successful at Manchester United - he just needs some time. The way he thinks and the way he wants to train and play is not something you can demonstrate in [a few] months.
"It will take some time and I hope he will be given that. You can already notice improvements within the team."
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