The Oranje boss believes there are at least eight teams with a better chance of triumphing in Brazil than his side
Oranje finished runners-up in 2010 - losing 1-0 to Spain after extra-time, but the former Bayern Munich boss feels competition to win the tournament will be even greater next summer.
"That would be a surprise, but I don't think so," he told ANP when asked of his country's chances of lifting the trophy.
"I can count eight teams who have a better chance of becoming world champions than Netherlands.
"I'm always real. I dream of becoming world champions. That's what I love for. That's why I'm the coach."
Van Gaal took over from Bert van Maarwijk in the summer after Oranje crashed out of Euro 2012 at the group stage and has led them to six wins from as many competitive matches.
Their next game is a friendly clash with Indonesia on June 7.