If United's failure to win any of their previous four matches hadn't already triggered alarm bells, reports of unrest between the manager and some of his key players surely must.
The window had barely shut when United played their first Premier League game of the season and Mourinho wasted no time in voicing his frustration about the club's failure to bring in his top targets.
United were held to a scoreless draw by the Spaniards on Tuesday, heaping further pressure on Portuguese manager Jose Mourinho. We have two matches against Juventus to make points.
Ander Herrera, another midfielder, was used in a three-man back line as Tottenham won 3-0 at Old Trafford in August.
Mourinho also praised Newcastle boss Rafael Benitez, despite the Magpies' poor start to the season where they only have two points after seven games and sit in the relegation zone.
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Mourinho was unhappy with the pair's distribution against Valencia and feels Matic's greater passing range could unlock Pogba in midfield. Don't get that anxious about what the manager said about you or the coaching staff.
'I know we are in the beginning of October and we look to tables all around Europe and in numerous leagues the tables in September and October don't reflect what is going to happen in a few months later or even in the end of the season, ' said Mourinho.
United are looking to avoid going five matches without a win for just the second time since 1999. If Mourinho can still get him to play well on a regular basis then does it matter?
Manchester United were charged yesterday with arriving late at their home stadium for a Champions League match and face punishment from UEFA.
"The Magpies have had a bad start to the season and, however their manager organises his players, I can not see them really having much joy on the counter-attack".
That's exactly how it's panned out, and while there's still time to turn the season around, the apparent lack of chemistry and desire among the United squad is concerning at best.