Amongst many other mids. There's probably a dozen or more mids in football who would massively improve us. Especially considering that it sounds like we are seriously entertaining the idea of selling Pjanic.
Unfortunately, only Ndombele seems a possibility right now.
Others like Pogba, Saul, Eriksen, Verratti, De Bruyne, etc are all out of reach imo.
So Ndombele is likely the best bet for an actual upgrade, and then looking at unknowns such as young players like Zaniolo, Tonali.