#3 Pressure to get results and logistics
United have had a terrible season so far, especially in the Premier League. They are currently 6th, 19 points off the top and points-wise they are closer to the relegation zone than they are to leaders Liverpool.
Getting an established manager on board in such a scenario is not easy for two reasons: the pressure to get instant results and the money that's involved.
There would be very few managers if any, that would take up the manager's role at a club like United mid-season when the club is in a crisis.
Moreover, United had to reportedly pay £22.5 million to let Mourinho go and the club hierarchy would surely not be happy about that. Getting another manager of his caliber and stature would surely prove too expensive for the club.
The management's reluctance to sign players that Mourinho wanted at the start of the season proves that the club hierarchy isn't spend-thrift like their counterparts in the blue half of the city.
Solskjær's appointment, for these reasons, seems like the right choice. Will he be able to rescue United's season and restore some of the club's pride? Will he turn out to be United's Zidane or will his reign be cut short at the end of the season or perhaps even earlier? These questions will only be answered on the pitch as United take on Cardiff City, Solskjær's former club, in the league today.