It's understood a heated exchange in the dressing room prompted the players to voice their opinions, accusing the Dutchman of a 'lack of creativity and flexibility'.
He told talkSPORT: "I think it’s normal when you have a transition with coaches, there are always people who like to stay in their comfort zone and have no change.
“But some people think change is good and I think that is more important. You have to have a change once in a while.
“I think Louis is directly adapting some players and I think that takes time and I think we saw that for many years with him.
GETTY
Ronald De Boer believes the players need time to adapt to Louis van Gaal's style
“At the end everybody believed in his way of thinking and everybody was getting the same ideas. I think that’s the transition he is in now I guess.
“I think it [the criticism] is unfair. He has his own philosophy and ideas and he’s very difficult to push him aside.
"That’s also his strength because as a manager you need your own philosophy and in the end he has strong belief of where he will end up with his team and that’s a strong point for him.”
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