Mbappe is set to become a free agent as things stand, as his contract with Paris Saint-Germain expires at the end of the campaign and would be able to leave on a free transfer.
Haaland, meanwhile, looks likely to be in the middle of a bidding war between Manchester City and Los Blancos as he is expected to leave Borussia Dortmund next season.
Courtois had praise for both strikers and claimed it's better to have players of their quality on your side rather than have them play against you.
"Obviously, they are two great players, very young, that are marking a new chapter," Courtois said in an interview with Diario AS.
"But this is not a theme for me. They are other people and they will have to decide.
"But it is evident that they are two cracks (top players) and if they play in your team, it's better than if they are against you."
