I think the 1st thing he needs to do is implement his ideas to our bread and butter, 4-3-3. That could take a month, but hopefully less.
After that, he can begin experimenting with different setups. I would quite like to see his 4-1-4-1 (the one he played against us with Las Palmas) in the CL KO's away, for example.
[tw]1218325473828253696[/tw]
---------------MATS-----------------
Semedo-Pique-Umtiti/Lenglet-Alba
--------------Busquets--------------
---------Arthur-------Frenkie-------
Griezmann-----------------Dembele
----------------Messi----------------
With Griezmann and Leo switching positions when needed. This lineup would also allow Leo to do what he does during the defensive phase, walking.
I'm not in favour of 3-5-2, because all of our CB's are turtles and we would get shredded by the wingers of the other team.