4-2-3-1, 4-4-2 or 4-3-3
Which one would you prefer, if you could pick?
Kepa is no 1 and there is nothing Frank can change.
From Conte leave, there are again 4 defenders row systems. 4-3-3 used by Sarri. Frank will use it also I guess.
While Sarri was using Kanté on the right, Jorginho as a centre midfielder and Barkley/Kovacic/Loftus-Cheek on the left, it seems, that Frank will put Kanté on his position, where he can be the best in the world. Defensive midfielder. Well, when he played higher, Chelsea had a better chance to get ball sooner, but I think DM is the "perfect fit" for Kanté.
If there will be only 1 attacker, I guess the most useful can be 4-2-3-1 formation.
There will be rotating Giroud, Abraham and maybe Batshuayi if he will not go for a loan. I think we won´t, because there is no possibility to buy anyone later on, so Chelsea will try to use as many own players as possible.
My ideal start 11
I would pick 4-2-3-1 with this team
Azpiliqueta - Zouma - Rudiger - Emerson
Kanté - Jorginho
Willian - Mount - Pulišić
Let me know down in the comment section, what do you think about it?