They'll try to make a move for Mbappe to replace Cristiano. You won't exactly replace him, but Mbappe might be the next best thing they can get.
They brought back Vallejo who's been the biggest Spanish CB talent for a while and did well in Germany. He'll now be their 3rd CB and get a lot of chances to establish himself the next few years and gradually replace Ramos. Meanwhile they'll definitely also look at other CB options.
They already have Isco there to replace Modric. Is it a like-for-like replacement? No exactly, but they'll play differently then. Then Kovacic is promising too and they seem to regard him as Modric's actual successor, although he need more minutes.
They're definitely doing better than Barca. We took three years to find a CB like Vallejo in Umtiti lol.
As for replacing Xavi, Iniesta or Alves......not exactly done that. With the former we brought in Rakitic and played in a different way, but that seemed to be short-term rather being in for the long haul like Madrid will be with Isco and Kroos.
The way they assembled their squad is very impressing, especially when you consider that they're paying less wages than we do, and they did that with NO Sporting Director!
