Clrnc The more I think about it, the more Camavinga makes sense. He is a technical midfielder that can play left back, so a possible back up to Zinchenko.
His preferred role is the Partey role and he can give you most of the things that Partey does: ability to defend a huge area on his own (something Jorginho for example can't do), dribbling (which can be very useful when all passing options are blocked), elite ball winning skills, pace, good passing skills etc I hope he grows few inches taller as we need more height in midfield given how short our forward line is.
He can also play the Xhaka role, this is his best position according to Ancelotti. I think he's a potential Xhaka upgrade as he's better on the ball and can also give you Xhaka's ball winning skills. However he could be impossible to get as I wouldn't be shocked if he displaces Tchouameni (who is also a very good midfielder) from the starting XI soon. But we know Real Madrid like a shiny new toy, so they might be keen to do business in order to bring in Bellingham.
Furthermore, I think we need a high volume passer in midfield, someone in the ilk of Kroos, Enzo Fernandez, Bruno Guimaraes etc. However there are not loads of them around, so that's going to be difficult.