A common mistake, at least amongst journalists and fans, is to think individuals need replaced. While it's true to some extent, that's not really how it works.
Classic case is Lennon Miller. After we sold him, we reshaped our midfield, brought in guys like Fadinger, Watt and Just and changed the way we played.
In the end, we had a stronger midfield that the one Miller played in, without ever replacing Miller directly.