The hard truth is.
For genuine title aspirations, the only cebtral midfielder you'd currently keep is thiago, the rest, in a nutshell, are past it.
Hendo, Milner, Fabinho are genuinely finished at this level, keita and chamberlain are too injury prone. Thiago is similar, but he's so bloody good when fit, that you'd easily keep him.
But we genuinely need two starting central midfielders.