-Regarding the profile, we are actually very flexible with the profile we need. Having only FDJ who is sure thing for next 3 years.
There is Savic,Ruiz, Aouar, Partey,Ndidi,Eduardo Camavinga & Kai Havertz. All are decent players to follow and see what we need, especially if we are going for 442, this gives us huge flexibility in picking our midfield. There is also a cheap stop gap ,albeit old, Thiago. I won't mind getting a young one and Thiago for next year.
-Regarding our attack, who is that sure thing either? Lautaro? Neymar? Werner? All have serious question marks. In addition it is even questionable if they fit here.
Neymar means we continue to play the pseudo 433, which would always make it harder for our midfield. Lautaro/Werner makes it a big possibility with continuing to have 3 attackers who provide no width.
In addition, it is very unlikely that with Lautaro/Neymar/Sancho here we would be able to spend big on defense either.
Unless we sell Griezmann or find some sucker who will pay 70M+ for Coutinho, I really don't like the idea of going after an attacker.
We aren't going for the 4-4-2 long term. We might use it for now (if that), because we are short in personnel for the time being, especially on the wing, but the midfielders we bring have to be very comfortable playing in a 3.
Everybody has question marks if we take it like that. I have said in the past and I'm saying it now, I'm not a believer that you just buy players and they fit perfectly just like that. Maybe 1 in 10 signings has this sort of ideal fit, the generational talent. A team maybe manages to get 1 of these players in a couple of years. That is why I think the manager and the board are so important.
We need to look at player profile more. Imo, we have neglected this part and went for the wrong players style wise. Looking back, Dembele was sort of a next Neymar-wannabe signing. We thought he is the next Neymar, but the talent component in Neymar's game is huge. And is unmatched by Dembele's talent, which is good, but nowhere near Neymar.
What are the main qualities we need for our game? This will tell us what kind of players we need, while also having a very realistic understanding of our flaws, which are pretty clear. Look at Vidal, he is basically a has-been who is now a starter because he is strong where we are the weakest.
Basically we need players who are skilled in our way of playing and/or can bring something we don't have. For the first part, which is players who have a great fit with our style, we have Arthur and Frenkie de Jong. So we're set and well covered in terms of great midfielders on the ball. We badly need that 3rd midfielder who can balance our midfield and bring us what we lack. Which is tactical intelligence, good shooting and a great physical presence. Somebody who'd have a good burst of acceleration when a ball is lost and good stamina, and would be pressing hard to get the ball back. This will allow our on the ball midfielders to up the risk taking and try more penetrating passes, because this 3rd midfielder will have their back.
For example, we usually go for more star-like forwards who don't really work very hard off the ball. This means we can't afford to sign a very offensive midfielder who is also slacking off at this chapter. So no pure AM for me. Absolutely not. No Coutinho, Isco, Ozil types. At least not until Messi is gone. Based on my, admittedly limited viewing of Bundesliga games, I would discard Havertz because he is too offensive and not enough of an impact off the ball, in negative transition. Attack-defense transition is a very weak point of ours. So we need physical explosive players who would react very fast and aggressive on turnovers happening near them. Milinkovic Savic is great at this, Thomas Partey is very good, and Fabian Ruiz is also good. Don't follow French league and have no idea about Aouar and Camavinga.
Maybe we can look at it from a more statistic driven position. Make a list of players from the big leagues with the midfielders who have the highest km per game ran, high number of tackles and interceptions, good number of long range goals, good number of fouls per received yellow cards, good number of individual duels won, especially defensively. And other stats like that. Most of these informations are related to transition. A player who fouls a lot and receives few yellow cards (think Casemiro) can be an asset in defensive transition. A player who runs a lot has more chances to cover exposed areas in time. A player who scores from long range can save you on a bad day in a key game away in CL. A player who makes tackles and interceptions is vital in spilled balls and essential in counter pressing schemes (I imagine Milner and Henderson rank very high in most these areas, which is why they are very important despite obvious technical limitations - which were visible against the compact team of Atletico).