Would love to see the texts between Van Gaal and Mourinho ahead of that game. I'm sure both will be very eager to get one over on the other.
Enjoy their friendship while it lasts, at some point it could deteriorate. Prior to the champions league final Louis van Gaal played against Mourinho he said that Mourinho doesn't care for attractive football, 'we both play to win but I want to express good football, my way is more difficult than his'. I also recall reading he criticised him and Inter's approach to the champions league final, he feels football should be a spectacle for the fans.
This was interesting too:
Angel di Maria
On Van Gaal: “We get on very well, he was one of the reasons I came here. I’m very grateful to him because he wanted to sign me. That makes me happy. Also, he’s a person who wants to win all the time, and to take the club back into the Champions League as quickly as possible, so the focus is very much on that.”
On Mourinho: “He taught me many things, he made me grow as a player. He helped me to move to a new position, to provide more sacrifice to the team in general. I am very grateful to him. He said that at Real I should be a forward who in turn could also defend. I could not rest on every play when the opponent attacked us. Mourinho made me a better player.”
Juan Mata
On Van Gaal: “He has so much experience and I can learn a lot from him. He’s tough when he has to be. He says things in a firm way, intensely, but then he’s somebody who is very close with the players. He really likes to talk with us, to ask us what we think about the exercises that we do in training.”
On Mourinho: “For better or for worse, we had no relationship, there was no dialogue. I was not happy, but always gave my all and respected my colleagues. You never know what will happen in life.”
Arjen Robben
On Van Gaal: “He has been very important to my career. Along with Pep Guardiola, I can say he is the best coach I ever had. I have worked with Van Gaal at Bayern as well as with Holland, so I have known him for a very long time. He is one of the few coaches who can make teams play better. He makes players better.”
On Mourinho: “I think very highly of Mourinho. The thing about Jose is that he will win at any cost. He doesn't care how, he just wants to win. I've not always been supportive of the style of football he plays, but he is a winner who has achieved great success.”
Wesley Sneijder
On Van Gaal: “He trains his players very hard and always expects the highest standards. In the Netherlands, Van Gaal is something like the head teacher of a school. Not everyone is lucky enough to get into his good books.”
On Mourinho: “He is a very special person for me. As a coach he is incredible, number one. It was he who gave me confidence, and I enjoyed playing football like never before. And as a person he reaches you much more than in his role as coach. Mourinho is like a second father.”