While United had their best ever finish in the post Sir Alex Ferguson era last time out, they still finished a whopping 19 points behind their Manchester rivals who won the league at an absolute canter.
Indeed, you have to go back to April 2015 when United beat City 4-2 for the last home league win for either of the Mancunian giants.
The Sky Blues have invested more than £535 million in new signings since the 41-year-old took charge - a figure that's given Mourinho some handy ammunition ahead of Sunday's Manchester derby. United, on the other hand, have a dismal defensive record as they have already let in 18 goals in just 11 games.
'There are little things in his game that I'm not a big fan of. "I don't think it's easy for him".
"My heart says United will win 2-1 because they'll basically stay in the game and score two late goals after City failed to kill them off".
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Toronto took a 71-49 lead into halftime. "They came out and just hit us right in the mouth". Walton said he warned the Lakers that overlooking the Raptors sans Leonard would be risky .
I was on the bench for that game and I was itching to get on.
"At the moment, he has Lindelof and Smalling but they don't inspire confidence throughout the team and as soon as that transfer window opens I'm sure they will be out looking for centre-backs again".
"It is not about scoring for one season, it is about scoring goals in your career".
United have spent extensively in central defence, midfield and attack during Mourinho's reign, although the manager chose to focus on the full-back positions, an area in which City invested heavily in the summer of 2017, when they signed Kyle Walker, Benjamin Mendy and Danilo.
Belgium striker Romelu Lukaku has missed United's past two matches with a muscle problem, but could return against City.
"Lukaku is training with the team this morning", said Mourinho.