Lavezzi would fit very very well in this team, adding something we definitely don't have today. We don't know how Coman will pan out, we don't really have an idea of what he can bring to the table.
But Lavezzi is 29, he would be a Vucinic/Quagliarella kind of transfer - we'd never get anything in return for him. No resale value. Also, he relies a lot on athleticism, that should decay in 1 or 2 years.
But discussing him is pointless anyway. We literally stole Coman from PSG, and we are doing the same with Rabiot. They would rather losing a player for free to another club than making business with us.
And next mercato I'm sure they will go straight to Pogba offering monstrous wages and try to make him push to leave, pushing his price down.
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Kagawa would be perfect.
But no hopes on that deal.
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Imagine if instead of spending 50M on Sturaro + Pereyra + Morata + Romulo we would have spent 50M on Kagawa + Shaqiri.
Anyways, United and Bayern won't accept many installments. We can't affor them anyway. We can commit to 25M in long term, but we can't give them like 10M upfront. So we can't land these guys actually.