I do think that the system lacks any width as the two behind the striker are meant to be 10’s with the wing backs providing the width but a left hand side of Dalot and Fernandes lacks any pace, width and power as both have to cut back with a flat pass as neither can beat a man.
The obvious example of a 3-4-3 working is Chelsea under Conte but the difference was Conte had wingers in Hazard, Pedro and Willian and a wide playmaker in Oscar whilst they had a winger on one side as a wing back in Moses and a proper wing back on the left in Alonso.
We’re playing a right back at left wing back, a right back at right wing back and a central 10 with zero pace and who has a problem with sticking up top so drifts deep into midfield and takes the ball off the central midfielders leaving us in a positional mess to a left sided 10 role.
It’s clear that going from todays game alone Onana, Dalot and Fernandes can NOT play in an Amorim team with a 3-4-3 and then there’s Rashford, Garnacho, Antony and Zirkzee who also don’t look like they fit through either a horrible attitude or simply not being good enough and that’s before I mention Shaw, Malacia and Mount who are all permanently injured.
We NEED two left wing backs if Amass isn’t ready, a right wing back, a Carrick type midfielder, at least one attacking midfielder/winger and an established striker who will press hard from the front and score goals so at least 6 players in but the problem is our PSR/FFP is meant to be borderline.
In a 3-4-3 I think Mazraoui is best at right sided centre back so that position is fine with Mazraoui and Yoro, the central of the three is fine with De Ligt and Maguire, the left sided centre back role could be improved on but if Shaw can stay semi fit then he can be back up to Martinez until Kukonki is ready.
Dalot is at best a back up right wing back, in the middle we’ve got Ugarte and Mainoo but Casemiro and Eriksen will both be gone in the summer, Diallo staying is a must whilst Hojlund is good as a back up striker so I’d keep Mazraoui, Yoro, De Ligt, Maguire, Martinez, Shaw, Dalot, Amass, Mainoo, Ugarte, Diallo and Hojlund but the rest I’d happily move on and bring in players to play the system.