The Netherlands boss believes the German champion is on track to win three major trophies again this season and feels he is partially responsible for the club's success.
The Allianz Arena side won the Bundesliga, Champions League and DFB Pokal under Jupp Heynckes in 2012-13 and Van Gaal believes the club could successfully defend all if its titles.
"It is going to be very difficult to win the treble again as no team has ever successfully defended their Champions League title, but I believe in this Bayern," the Netherlands coach told Bild. "The bad thing about it is that the Champions League final only takes place on May 24. That means I will be without Arjen Robben when we start our preparations for the World Cup."
Van Gaal enjoyed a successful spell in charge of Bayern between 2009 and 2011 and he feels the club's current dominance is partially down to his contribution.
"I believe that I have played my part in Bayern's success, but it is always the players and the coach who actually do the job," he said. "Heynckes did a great job and Pep Guardiola is doing the same. Jupp used the same tactical plans I used. Guardiola on the other hand has introduced a new style and it's great to see that this works, too.
"I am very proud of Bayern."