No, he's just not good enough.
Now the question is: why are we ready to buy him for 23 million euros?
Because he's canterano?
I'm ok if this is our negotiating strategy. The only problem with a waiting approach is we'd only have 3 CBs for half or possibly the whole next season. I don't believe we'll manage to offload Umtiti anyway but he can't be seriously counted on to stay fit and even when he's available to play he's a big liability.