#3 A hungry Zlatan
The January transfer window is likely to be a pivotal point in the season, but Mourinho has already grabbed an early sale. Zlatan Ibrahimovic had a huge impact upon his arrival last season and defied his age to become one of United's most influential and important players.
His long-term injury means that he is currently cutting a frustrated figure in the gym and on the sidelines, but he will be back in time to push for the honours that United will inevitably be challenging for, and he will be desperate to make up for lost time.
And with Mourinho's side expected to be challenging on a number of fronts, his return will be a timely boost. There is no doubt that Guardiola will also be keen to strengthen his squad yet again once the window opens, but Ibrahimovic is already well-versed in Mourinho's methods and will hit the ground running with the team in the most effective of positions. Guardiola will do well to find himself a similar addition.