Near the top of the list for ways that Chelsea can become a better team overnight, would be with the return of N'Golo Kante.
It's a bit simplistic and the sample sizes are skewed, but Chelsea have won just two of the six games without Kante this season and didn't lose with him in the side. The downfall of Thomas Tuchel at Chelsea coincided largely with the Frenchman's injury in the second half against Tottenham two games into the campaign.
After that, Tuchel was forced to use makeshift pivots with Conor Gallagher and Jorginho, falling short on tempo control, physicality, discipline and defensive shape with the pair together. Tuchel chose not to trial different shapes to use Carney Chukwuemeka or Billy Gilmour and was eventually sacked after defeat at Dinamo Zagreb.