Gary Neville says the Man Utd players and their representatives are responsible for leaking stories of dressing room unrest to the media.
Ralf Rangnick has failed to make big improvements to Man Utd performances after replacing Ole Gunnar Solskjaer as interim boss until the end of the season.
Results have been mixed too with two 1-1 draws from their last two matches after being dumped out of the FA Cup on penalties to Championship side Middlesbrough.
There have been rumours of fall-outs in the Man Utd dressing room over Mason Greenwood’s arrest and Rangnick’s treatment of Jesse Lingard, while one report last week claimed that some players have likened assistant Chris Armas to fictional soccer coach Ted Lasso.
“I thought that was downright disrespectful on Friday – I did not find it funny at all,” Neville said on his Sky Sports podcast.
“That they were describing Ralf Rangnick’s number two as Ted Lasso was not funny at all and not only was it disrespectful, but I found it disgusting. It sums up what I think of them: that they are disrespectful.
“I think if I was Ralf Rangnick and his number two, I would gain strength from that because I would not want to be on the same page of some of those players who are leaking those types of stories.
“That never happened in my time but we had the greatest level of stability.”
Neville added: “I remember when I joined Sky and we had the Champions League in the early years, and I went over to Napoli to do a game involving Chelsea.
“It was when Andre Villas-Boas was their manager and he left out Frank Lampard, Michael Essien, Ashley Cole – four or five prominent players.
“That is what managers tend to do in their final days at a club, as they see it as a free hit. I remember sitting there at lunchtime with our team and they were getting messages of team news being leaked and the manager being slagged off, and I sat there thinking, “does this actually happen?”
“Players agents and PR teams were briefing the media on a matchday about what was going on inside a club, and it was the first time I had seen it and known for it to happen – it really unnerved me.
“That is happening at Manchester United now – they are at it, the PR teams, the agents and the marketing teams, as a self-preservation for their own player.
“But what they do not realise is that unfortunately, when they go to the media then those media people go to us – so we know who is briefing.
“The reality is that we do not like it, but we know who it is. We are not going to throw people under a bus here because we have that journalistic respect – but they are it in the same way that Chelsea were all those years ago.
“They need to stop it and work as hard as they can.”