Van Gaal says he envies Belgium counterpart Roberto Martinez due to Courtois.
He said, "I'm jealous of Roberto Martinez, yes. Sometimes I criticiszed Thibaut Courtois, but he is a top goalkeeper. Sometimes he makes a mistake, because it happens when you are under pressure, but it happens.
"I don't know what Belgium will do tomorrow against us, but I have analysed three duels and in those three games play the same way. I believe in my players. They do everything to win, I prepare them for that.
"That's why I don't expect the boys to take it too easily. The players are always focused."