Louis van Gaal's Manchester United suffered a rather embarrassing 5-3 defeat at the hands of newly-promoted Leicester City on Sunday, collapsing in humiliating fashion after leading 3-1 in the second half at the King Power Stadium.
Emotions in the away dressing room after the match would surely have been running high and, according to the latest reports from the Daily Mail, one Manchester United player was supposedly heard calling one of Van Gaal's most important decisions over the 90 minutes into serious question.
Despite Angel di Maria - who scored a delightful chip to put the visitors 2-0 up early on - having performed very well indeed, the £59.7 million man was substituted 14 minutes from time to be replaced by Juan Mata.
Now, while such a change surely cannot be held accountable for the chaos that ensued in Manchester United's panicked defence, it appears that one of Van Gaal's current squad members was incensed by the decision.
"Why the f*** did we substitute Di Maria?" one of the Argentine's teammates - whose identity is unknown at this stage - apparently enquired in the heat of the moment with tempers understandably frayed.
While the unnamed player may be right to query that particular event, what was far more concerning for Manchester United was the manner in which their defence capitulated in the East Midlands.
It is true that much-maligned referee Mark Clattenburg should not have awarded Leicester a penalty after the in-form Jamie Vardy tumbled under the softest of brushes from Rafael mere moments after he had committed a clear push on the Brazilian full-back, but, nevertheless, it is important to note that even after David Nugent drove home the resulting spot-kick, Manchester United still led at this stage the lack of composure, quality and indeed professionalism displayed over the course of the game's final stages - during which time the unconvincing Tyler Blackett was dismissed for a last-man lunge on the aforementioned Vardy - was simply unforgivable.
For many, the manner of such an astonishing loss is a clear indication of the Red Devils' skewed priorities during the recent transfer window.
Although the additions of the likes of the irrepressible Di Maria and revered striker Radamel Falcao are sure to boost Manchester United's productivity in the final third, the departures of Nemanja Vidic and Rio Ferdinand - potentially even Patrice Evra - left the incoming Van Gaal woefully short of the necessary quality in defence.
A manager of the Dutchman's undisputed class and significant reputation would surely have been eager to address this issue, but his obvious failure - the signing of Marcos Rojo from Sporting Lisbon aside - to do so could have severe ramifications on his new employer's attempts to return to the top four of the Premier League anytime soon.
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