We're looking for a bit of a unicorn in truth. I don't believe people appreciate the dual contribution that Herrera offers in terms of defensive work rate to assist Matic along with attacking contribution to assist Pogba and our attackers.
For example my ideal replacement would be Neves as he offers the same variety of contribution at Wolves and is only 22 so has a greater potential. However when you compare it's clear that Herrera is still far ahead of Neves in terms of his contribution.
Likewise Neves is likely to cost £60m.