Nope, that's not true. We have players who can play left back currently in the squad (Peluso, Ogbonna, Chiellini, Caceres - and we also let De Ceglie go). Have a look elsewhere around the squad to see where the issue lies.
We have no use for a first choice quality left back within the current set up. If we are going to change to a 4-3-3 then we will probably need one (subjective - I'd use Ogbonna there with a more attacking side in front of him), and we will also need effective attacking wing forwards/wingers.
Conte changed initially from a 4-4-2/4-2-4 to a 4-3-3 to incorporate three key CM players, then to 3-5-2 to incorporate his three key central defenders.
Peluso is a serie B player, he can be a starter in serie A and not in a team of our level,
if we opt to play witha player there, he will be used in almost every match and most esp in the important ones, Conte doesnt risk at the important ones, esp in the defense, he uses the starters as much as he cans, so we need to use a reliable solution, infortunately DC is not that...
Chiellini can play there, but he cannot be missed from the center of our defense, every time he misses from there, our defense suffers, so again he can only be used as a back up solution, only to cover the main LB.
Caceres could be an interesting option to explore, esp in our LWB set up, but for some reason Conte does not considers him for that, maybe because of his anterior spell with us, in that position...
I really dont know if Ogbonna can play as LB in a 4-3-3
We do have a use of a LB, and Licht is an example of that!
A Kolarov class LB could be used both in 4-3-3 or 3-5-2. But Marotta is simply uncapable of getting out, because his limited capabilities for that option, cant go beyond Italian players...
Marotta has been trying to sign a LB ever since he joined, but he fails in every single transfer window, either be winter or summer.
Chances are that we will lose Kolarov from Napoli once again...
As for the wingers, they would be essential only in a 4-4-2, not in 3-5-2 or 4-3-3, in that formation, we will use 3 CMs, 2SSs and one CF, Osvaldo better be the Llorente rotation and for the left SS spot, we have Tevez and Giovinco.
As for the the middle three, apart from the current 4 options, a new starter LB, would allow Asamoah to be be used there when not needed in the left flank.
The tactical options we will have with a new LB will allow us great tweakin, atm Conte's hands are tied, he has chosen the best formation to fit our material (lack of wingbacks,weak CBs, abundance of CMs and SSs)
Our defense need the extra defensive line in the midfield, because they cant handle the pressure by themselves, if were to reduce the ammount of midfielders, this pressure would raise sky high.
When Conte took over, we didnt have Barzagli and Licht, (and they only joined us because he demanded it, he also demanded for a LB, but MArotta has been failing ever since)
not the only thing we need for a 4 man defense is a starter, dedicated LB, this is the only reason that we cannnot field a formation with that compenent...