TLDR:
Instead of...:
Jorginho --> Brozovic
Rüdiger --> Koulibaly
Kepa --> Alisson

Summary:
Maurizio Sarri arrives after the sacking of Conte.

Sarri brought with him a special player from his Napoli side, which turned out to be Jorginho. IMO Koulibaly should've joined Chelsea a long time ago, and if he'd gone along with Sarri to England, imagine the impact it would've had on our defense.

Since the departure of Matic, Chelsea has failed to sign a strong DM. Their decision to loan a young Kovacic from Real Madrid was an amazing transfer and imagine him playing alongside Croatian teammate Brozovic from Inter.

Alisson was a favourite to replace Courtois beside Jan Oblak at the time. We all know how he turned out in the Prem, compared to the massive failure that was Kepa Arizzabalaga.