The Dutchman's first appearance as United boss on home soil was greeted with ferver by supporters, but even the renewed confidence at the club cannot compensate for a patchy squad
Those who suggested last May that Manchester United needed a world-renowned name to replace Sir Alex Ferguson have only been vindicated by Louis van Gaal's first few months in charge at Old Trafford.
For all their talk of vast riches and links to a swathe of stellar names, as yet only Luke Shaw and Ander Herrera have committed to a team that is without Champions League football in the season ahead.
As a result, so many of the players written off as not being of sufficient standard under David Moyes are in position to play key roles as the Premier League kick-off edges nearer.
But with a manager with the gravitas of Van Gaal in charge, none of that seems to matter too much.
Last season United fans descended into the type of doom only those who remember Ferguson's early years can relate to. Moyes never gained the respect or displayed the ability to overbear opposing teams, or even convince his own support, but with Van Gaal it is part of the package; a hugely experienced, slightly erratic, utterly commanding presence.
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Van Gaal's first Old Trafford appearance as United boss was greeted with predictable warmth by the club's fans, but the 90 minutes against Valencia served up plenty of reminders of the task at hand, friendly or not.
While the Dutchman's emergence from the tunnel before kick-off was greeted with ferver, the match itself was standard pre-season fare. Wayne Rooney missed a first-half penalty before Darren Fletcher's deflected shot bounced over Diego Alves. Tom Cleverley's dubious clearance allowed Rodrigo Moreno to lash into the net and equalise, but Marouane Fellaini, after his every touch was ironically and cruelly cheered by the home fans, bundled home a late winner to turn the irony to genuine joy.
As a result United secured an unbeaten pre-season, having seen off La Galaxy, Roma, Inter, Real Madrid, Liverpool and now Valencia.
Some have even tipped the Red Devils for a title charge, but even this renewed confidence can surely not fill the gaping holes in the squad.
Deploying, once again, the 3-4-1-2 formation, United had Ashley Young and Phil Jones on the right-hand side, as derided a duo as you could find in the club's recent past. We are still in friendly territory of course, where line-ups and form are of no indication of future intent, but, in truth, Van Gaal doesn't have many other options.
Jones, Chris Smalling and Jonny Evans remain the three senior centre-backs, while on the flanks Young and Antonio Valencia remind those getting overexcited of the obvious limitations. In midfield the club are currently relying on Darren Fletcher to have recovered from serious illness and for Ander Herrera to take to English football immediately.
Van Gaal's supporters will point to the effectiveness of his Netherlands side at the World Cup as a case study for how a team with just one or two stars can still compete for honours. But there's a difference between a knockout competition and the long slog of a Premier League - or even top four - challenge.
Even on the basis of a pre-season homecoming it's clear that this back line is too easy to get at, and not sufficiently organised to keep out midfield runners, particularly on the flanks. Those aren't problems that can be solved overnight, and given the strengthening of Chelsea, Arsenal, Manchester City and arguably Liverpool over the summer months, there needs to be new additions to compliment the good will and renewed optimism.
Van Gaal clearly knows the limitations: "The main thing is we won, despite playing our worst game," he said after the match.
The show-stopping signing, the one that United used to make in reaction to emerging threats, is surely still to come. If not, it could be a tough season by anybody's standards - especially Van Gaal's.