#3 A backup striker in the January transfer window
It's strange to think of a club as rich as Real Madrid having a thin squad, but that is precisely where they are, most notably in the central striker position. Borja Mayoral, for all of his effort and endeavour, is simply not good enough to be second-choice - especially at his age.
Karim Benzema's injury threw Zidane's well-settled team for a loop, with Ronaldo having to fill in in a position that he does well when he ends up in it, and not when he starts from there.
Timo Werner would be an ideal striker for Real Madrid, as Los Blancos could conceivably move for the young German in January. More than offering Karim Benzema rest, Werner would represent a player who would offer plenty of pace centrally, thus allowing Zidane's side to switch to another system when things are not going to plan.