4) Lack Of Rotation
Chelsea have a settled first XI, which has been hugely helpful for Mourinho, especially while the rest of their Premier League rivals struggle to integrate their new signings.
The issue with Mourinho’s aversion to rotation will only become apparent later in the year. As fatigue accumulates and Chelsea get deeper into the Champions League, one of the weakened sides they put out in the league is sure to slip up and ruin the perfect record.