Ahead of their meeting with Australia on Wednesday, Van Gaal believes that one result is not enough for his players to relax as they look to secure their spot in the second round.
"Nothing has changed, the team reacted very well, especially the more experienced players, they understand what is going on," the Dutch coach, who will join Manchester United after the World Cup, told reporters.
"They knew that was just one win, we haven't even qualified yet, so I see this attitude in a positive way.
"At the same time, I must prepare this team for the next match. So no new approach to what we've been doing."
A victory on Wednesday would see Van Gaal's side qualify if Chile also beat Spain.