One big thing people seem to forget about Fernandinho is that, yes he is 33 and will be 34 next season, but he is also playing nearly every game.
Buy Ndombele or De Jong then all of a sudden Fernandinho gets MUCH more rest, meaning he can last WAY longer, by that I mean I see no reason he can't play for us until he is 36 or 37 years old.
This isn't even mentioning the fact that Delph actually looked really good as our DM against Fulham, he is similar to De Jong in that he dribbles to be press-resistant and has excellent passing range.
Would not be upset if in a couple years our DM combo is De Jong / Delph and hoping for an EDS member to come in at some point in 4-6 years.