Mendy still has Camavinga for them. The problem is that when Modric leaves, there will definitely be some conditions which are indeed very difficult, considering that Modric's performance will clearly make a difference. Even though there are players like Tchouameni or Ceballos there, this is still a bit of a problem.
The first leg is clear Modric is definitely going but on the other hand with yesterday's win in the Copa del Rey it will definitely lift their spirits.
For Manchester City there is some news about De Bruyne who is already able to play and will definitely be there for the first leg later and this will obviously be very difficult for Madrid.
I totally agree that Lukas Modric's departure whenever it happens will make a huge difference even with the presence of Tchouameni or Ceballos, either of these players cannot match Modric's brilliance and work rate in the team. If Kevin De Bruyne makes the first leg it will definitely boosts Manchester City's advantage going into the game.