The Dutch are back in action tonight when they face Argentina in the semi-finals in Sao Paulo.
When asked if his side is capable of lifting the trophy on July 13, Van Gaal told FIFA.com: "Yes, I think so.
"We got through the group stage against Spain, the world champions, unbeatable for two years; against Australia – we had never beaten Australia before; and we beat the runners-up, Chile. They are all very good sides, so that has given the team a boost, confidence to the players.
"We are very difficult to beat. That's down to our organisation and also the belief and confidence that we have, that we have to battle for every victory."
Despite reaching three World Cup finals, the Netherlands have never won the tournament.