Amid newspaper speculation he could be sacked this weekend, Mourinho's side fell 2-0 behind as early as the 10th minute after goals from Kenedy and Yoshinori Muto fired the visitors - who haven't won in the league this season - into a shock lead.
It was a move that even saw the likes of Paul Pogba and Nemanja Matic slot into the defence.
The result is also said to have been the last straw as it relates to the decision on Mourinho's future at the club.
Would they call for Mourinho out?
"Forget Cardiff or Huddersfield it would be Newcastle because they can't score a goal".
Second referendum to be ‘politicians vote: UK PM
Labour leader Jeremy Corbyn , she said, would "outsource our conscience to the Kremlin". "Austerity is not an economic necessity". Johnson's speech was also created to boost confidence around Britain's post-Brexit future.
That story sparked a furious reactions from United legend Gary Neville, who told Sky Sports that the hierarchy at the club needed to be changed as he claimed persistent leaks from Old Trafford insiders were undermining a succession of the club's managers. "For me, it's not easy too, but I think life is made of experiences and some are new and some are déjà vu, but this is new".
It stunned the United fans in attendance and forced Mourinho into a series of tactical substitutions, making the first one less than 20 minutes into the game.
- This is Newcastle's worst-ever start to a top-flight season after eight games in terms of points (2 - 3pts for a win).
A failure to do so ahead of the Newcastle game could be viewed by Mourinho as evidence of a loss of faith and therefore a clear signal that his time is up at United.
Jose Mourinho has revealed he received a text from a Manchester United board member ensuring him his job was not under threat.
What unfolds is Neville launching into a five-minute tirade against player-power at the club, executives playing "Football Manager" with the biggest team in the world and his belief that certain people that are running Manchester United are 'rotten to the core'. After the forthcoming global break, their next six games include matches against Chelsea, Juventus twice and Manchester City.