I also think so, overall Real Madrid's performance this season is very inconsistent and also the matches in UCL cannot be underestimated especially overall the strength of RB Salzburg and Brest is not that bad this season so it is also possible for RB Salzburg and Brest to make a surprise when playing against Real Madrid later.
I think everything is possible in the remaining 2 UCL matches before the playoffs later and I think Real Madrid cannot be favored excessively.
For the match against Salzburg I am not too worried, Real can win the match easily because as we see in the standings and also their overall performance, Salzburg is far from a team that can make a surprise especially in this match Real as the host. What I am quite worried about is against Brest, I think Real will have a little difficulty, Brest has performed very well in the UCL. But the point is that Ancelotti troops must get 6 points so that the chance to qualify for R16 can be guaranteed even though they have to go through the play-off round.