Liverpool's procession towards the Premier League title gathered pace during December, while elsewhere there were four new managers in the division.
Assistant managers must always be ready to step up to the plate in this ever-changing football world, where bosses can be sacked at the drop of a hat.
Everton's fine form under Carlo Ancelotti has seen them transformed from relegation candidates to top-four challengers.
Everton striker Moise Kean says he can now kick on and show his best form after netting his first goal for the club.