Well, I still consider the 3-5-2 as our main formation. The 4-3-3 also needs wingbacks. And i don't see DCosta and berna To play upfront, benching Dybala and Mandzukic. ( Pjaca will have one more chance this season and if he is injured again, that's it for him. )
So either playing as at the right midfield of the 3-5-2, or the right defence line in a 4-3-3 ranks as a wingback to me.
Our primary trident will remain mandzukic-higuain-dybala. I can see berardi fitting there but DCosta? No!
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Have you checked why is he on sale?