I doubt Zidane has told anyone what his plans are so anything in the papers at this point is just speculation however Madrid do need a big rebuild they've got problems in midfield and up front so they need to bring in some heavy hitters and clear the decks. They've squeezed every last drop out of this team and it's time to rebuild they can't just keep kicking the can down the road. My guess is they'll be looking to sell Bale and Modric rumours are they're open to selling Marcelo as well to raise cash for the rebuild as it won't be cheap.
That means the usual names will be put around Lewendowski, Hazard, Pogba, Kante, Kane, Icardi, Neymar, Mbappe, Dybala etc basically any big player who isn't at Barca will be on the radar.
The question is will Madrid continue looking to younger players so will they look at someone like Sancho or even Rashford or will they go for the more established players? My guess is they'll be looking for players who are hitting the prime rather than those who've been established at the top so players like Lewendowski may have missed their chance.