#2 They have built momentum in recent weeks
Only a few weeks ago, things were so turbulent at United that there were serious speculations linking Mourinho with a sack from his role in the Old Trafford dugout.
Confirmed rumors of infighting between player and coach, disorientation among fans over the direction the club was headed in and transfer shenanigans which ensured the club did not get most of its summer targets translated into disaster on the field, as Manchester United players could not buy a win.
Key players such as Pogba, Bailly, Sanchez and Martial were grossly underperforming, while even Mr ever-reliable David De Gea made a couple of uncharacteristic blips, which meant United made their worst start ever to a Premier League season, and they quickly found themselves ruled out of the title race.
Things have however improved in recent weeks, as Jose Mourinho has helped calm the storm, coming within few seconds of defeating Chelsea at Stamford Bridge, and following that up with three consecutive victories in all competitions, including two successive injury-time comeback victories over Bournemouth and the more fancied Juventus.
Manchester City have been so dominant for so long that it is easy to take their greatness for granted and for complacency to set in, but the momentum built by United in recent weeks is one which could see them cross the line in this immense battle against their city rivals.