When Van Gaal retires, winning the International Champions Cup will not rank among his greatest achievements.
The Dutchman already has 16 winner's medals of greater prestige, but the importance of winning this money-spinning pre-season tournament cannot be discounted.
Van Gaal's team won the final of the eight-team competition in the early hours of Tuesday morning when they beat Liverpool 3-1 thanks to goals from Wayne Rooney, Juan Mata and Jesse Lingard.
United beat Roma, Inter Milan (on penalties after a 0-0 draw) and Real Madrid en route to the final so Van Gaal is in an optimistic mood ahead of his first season in the Barclays Premier League.
"This will give us momentum, for sure," the United manager said.
Video: Manchester United 3 Liverpool 1 match report
"It's always better to win. First we beat Roma, then we beat Inter Milan with penalties but we were much better, then we beat Madrid and then we had a test against a Premier League team."
Steven Gerrard's penalty gave Liverpool the lead at a rain-soaked Sun Life Stadium, home of the Miami Dolphins, after Phil Jones had clattered into Raheem Sterling in the box.
Manchester United: Potential summer transfer targets
Manchester United: Potential summer transfer targets
1/19 Arturo Vidal
The Juventus midfielder is among United's top targets this summer, particularly after impressing for Chile at the World Cup. Having helped his current team secure the Serie A title, Juventus aren't keen on letting him go.
2/19 Marco Reus
Rumoured to be near the top of United's target list, a possible swap deal involving cash and Shinji Kagawa has been mentioned. The Borussia Dortmund player would not be a cheap acquisition, especially given his recent declaration that he wants to stay at Dortmund next season
3/19 Arda Turan
Former manager David Moyes had been seen watching Turan, though his dismissal put a doubt over whether United were still interested. The winger's agent claims an offer has been made, so is the Atletico Madrid winger on his way to Old Trafford?
4/19 Arjen Robben
The Bayern Munich winger has said Van Gaal has offered him a place at Old Trafford if he wants it. Currently he's happy to stay where he is, but things can quickly change.
5/19 Claudio Marchisio
With Paul Pogba highly unlikely to be prised away from Juventus, United's attention could turn to team-mate Claudio Marchisio. The Italian international would provide some class and experience.
6/19 Mats Hummels
With defensive reinforcements high on United's list of priorities, Borussia Dortmund's Mats Hummels has unsurprisingly been linked with a move to Old Trafford. The German has been earmarked as the ideal replacement for the now-departed Rio Ferdinand and after his impressive showing at the World Cup, he's even more desirable.
7/19 Raphael Varane
Raphael Varane has already snubbed United once in his career, opting instead to join Real Madrid. It would surely take a big offer to prise the classy defender away now.
8/19 Seamus Coleman
Reportedly already the subject of a £15m bid, Seamus Coleman could be the man being lined up as the answer to United's problems at right-back.
9/19 William Carvalho
The Sporting Lisbon midfielder has reportedly been watched 15 times by Manchester United, although the £29m asking price could prove a stumbling block. The Portugal international has also been linked with Arsenal.
10/19 Xherdan Shaqiri
Bayern Munich winger Xherdan Shaqiri has struggled to force his way into the first team at the Allianz Arena and could be a target for United as well as rivals Liverpool. His impressive displays for Switzerland this summer could make it harder to prise him away.
11/19 Alex Song
Barcelona are understood to be ready to let the former Arsenal player leave this summer. Could provide some strength to United's midfield. Could also bring embarrassment judging by his behaviour at the World Cup.
12/19 Fabio Coentrao
Supposedly came within hours of signing in January, the Portuguese left back could be brought in to provide back-up to Luke Shaw.
13/19 Julian Draxler
A long time Arsenal target, United are reportedly interested in pinching the young German with a bumper offer. Seems unlikely though. Arsenal also strongly interested.
14/19 Sami Khedira
The Germany international is reportedly being pursued by a host of sides, and United might be wise to get in the mix as they look to add some quality to a fairly feeble looking midfield. Real Madrid appear open to letting him go with the 27-year-old having just one year left on his contract. Arsenal and Chelsea are among the others keen on signing the World Cup winner.
15/19 Edinson Cavani
The Uruguayan hitman would prove pricey and tricky to snatch away from PSG and it seems unlikely United have enough to offer him.
16/19 Luciano Vietto
The Racing Club youngster has been impressing in Argentina for some time although a move directly to United would be something of a surprise.
17/19 Santiago Arias
Should a move for Seamus Coleman fail, PSV defender Arias is reportedly being lined up by United. Played for Colombia throughout the group stage of the World Cup.
18/19 Miralem Pjanic
Rumoured to part of a joint bid including teammate Benatia, the Bosnian midfielder is reportedly another on United's large hit list.
19/19 Kevin Strootman
Van Gaal knows Strootman well from working with him in the Netherlands set-up and has indicated he is interested. Roma are reluctant to sell whilst his recovery from a knee injury may prove a stumbling block.
Sterling continued to cause United problems, and he should have had a penalty when Ander Herrera pulled him down in the box just before half-time.
But United rode the storm and equalised when Javier Hernandez found Rooney at the back post and he beat Simon Mignolet with a well-taken volley.
Two minutes later, Mata's shot flew past Mignolet via a deflection off Mamadou Sakho.
And in the dying minutes Lingard put the result beyond doubt when he converted Ashley Young's cross.
Afterwards Van Gaal singled out Rooney, who was named player of the tournament for scoring three goals, for praise.
"He was always a man who is a winner," Van Gaal said.
"He deserved (to be player of the tournament) because he scored a lot of goals and gave a lot of assists.
"The goal was very important for him. It was a wonderful goal when you see the attack and what he did to push the ball under the legs of the opponent but also in the corner of the goal.
"It was a great cross from Chicharito (Hernandez) also. It was a very good attack."
Rooney captained United for the first time on the tour, which took United to Los Angeles, Denver, Washington DC, Detroit and finally to Florida.
Darren Fletcher was named skipper in the other two International Champions Cup games while Tom Cleverley was given the honour of captaining the side in the 7-0 win over the Los Angeles Galaxy.
Van Gaal has to decide who will captain United next season, but he was giving little away on whether it would be Rooney.
"I'm always looking for opportunities to give players the captain's brace [armband]," said Van Gaal, who is thought to be considering Robin van Persie and Jonny Evan as serious candidates too.
"Today Rooney played for the first time 90 minutes. Fletcher has already done it two times, therefore he was the captain.
"Cleverley also played 90 minutes. I think you have to choose when it is possible in English style. But it has to be possible."
Liverpool manager Brendan Rodgers was disappointed to lose after taking the lead in Miami.
"We were well worth the lead," said Rodgers, whose team had beaten Olympiacos, AC Milan and Manchester City before arriving in the Sunshine State.
"It looked like we should have had another penalty (when Herrera fouled Sterling).
"We conceded a disappointing goal and then conceded a second.
"But I am delighted with the whole tournament. We have been away what seems like a long time but we have worked hard and we have taken a lot of positives from this tour."