In regards to options after Eriksen, our best at the moment is Lamela to play that role. It's not the best, but it's all we've got currently.
It must be addressed in the summer. I know people will say why not now? But this late in the Jan window finding someone of the requisite quality to be up to Eriksen's level is impossible. No one is going to let a player of that quality go in the middle of a season.
Madrid are sinking. Maybe Isco could be a goer again when we get back in CL. A pipedream maybe.