He's supposed to have been an absolute revalation this year under Sampaoli, getting praise from all over the place, and under a manager very similar to Pep in style. so I don't doubt his quality for a second, Pep knows a good player when he sees one and he knows who fits his style.
The money and age are not the problem, we paid more for Fernandinho at almost the exact same age and it's been a bargain.
However the idea of spending €30m in January on a defensive midfielder of all positions is baffling. Fernandinho is back, Fernando is playing better than ever. Yaya is doing great.
CB and Fullback are the obvious weaknesses, everyone knows that.
I can only assume we would move Fernandinho to CB, play 343 and have Nzonzi play as pivot.