The Dutch manager's brutish man-management has always been something of a talking point throughout his tenure at Old Trafford, with Neville the latest to question his methods.
Robin van Persie, Angel Di Maria and Radamel Falcao all departed Manchester this summer, with a breakdown in relationship between the trio and Van Gaal said to have played a determining part in their respective moves.
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Of the three forwards, Di Maria, who played a bit-part role in United's side towards the latter end of last season, confirmed that his feelings towards the Dutchman had soured come the end of his spell with the Red Devils.
He said: "I started very well with him and then had a couple of clashes. There came a time when I did not have a good relationship with Van Gaal and that influences much in a player's mind."
As a result, Neville too shared his thoughts in his Telegraph column on the 64-year-old's dubious methods.
"For 25 years people talked of Sir Alex’s ‘hairdryer’ but Sir Alex had compassion, while Van Gaal tends to be colder in his dealings with players," he said.
"Di Maria, Valdes, Falcao, Rojo, Van Persie – and there are others. That’s too many players to get on the wrong side of. These are not bad lads.
"I know some of those lads, and they are what I would classify as really good professionals."
The eccentric manager was always going to be been prone to scrutiny given United's decline in recent years, with the Dutchman tasked with steering the 20-time champions back to the top of England's tree.
He hasn't, however, helped himself at times with decisions made bewildering to media and fans alike - something Neville too expresses.
"I am still saddened that Danny Welbeck left. I am saddened that Adnan Januzaj has been allowed to leave on loan to Borussia Dortmund.
"He went from playing four or five games on the bounce to going out on loan in Europe."
Van Gaal faces arguably his sternest test of the new season when his side host long-time rivals Liverpool at Old Trafford in the late kick off on Saturday, with the pressure mounting.