Given the fact that real madrid are now in super confident form... I think it won't be take too much impact even they play without benzema and modric , there are many options available though. They would still dominate the game and winning it in the end to qualify from the group stage , easy peasy for real madrid.
Real Madrid has already secured entry to the next stage of the Champions League, so the loss of these players should not be fatal for the club. Another question is that now the main question can only be from where it will be possible to do this and, in theory, the first place in the group can provide more advantageous positions and an easier opponent in the playoff stage. On the other hand, Leipzig, unlike Real Madrid, has not yet secured participation in the playoff stage, so the match is of the utmost importance for the club, especially since the match will be held at home. Also, let's not forget with what difficulty Real Madrid made a saving draw for themselves in the previous match with Shakhtar, along with Benzema and Modric in the squad, so I would not be in a hurry to say that Madrid should ensure at least a draw for itself. Moreover, the Real Madrid players can involuntarily keep in their heads that they will have the next match with Celtic at home.