If this guy leaves us we're screwed. More than that, we're done.
In order to replace him we'd have to sell Pogba, and I don't like this whole Cavani idea, the guy has flopped hard at PSG, as I've stated before I simply don't get the hype for Cavani that some people seem to have, not even when he was at Napoli tbh.
If we sell Pogba (for let's say 100M) and then expend 45M in Cavani, what are we gonna do? Play Morata-Cavani upfront? Who's gonna create the goals? Lets say we get Oscar for another 40M, and then what? We'd still have a massive hole in the midfield that not even Asamoah could fill if we were yet to sign a LB.
I'd rather just keep him one year, bring Dybala, and close the Mercato tbh. I wouldn't mind the other positions in which we may lack quality/depth as long as we keep Tevez and Pogba.
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And another thing, if we actually sell Pogba and try to 'build' a team with his money, I don't know if the 4312 would be the way to go, maybe for a year, or two, but we're still not going in the direction the rest of the big guys are by not getting any damn wingers.