On paper Real Madrid are far superior to Salzburg and Brest, but anything can happen as long as the match is still in progress. Although the chances for both clubs are very slim, it could be very decisive and could punish Real Madrid. What just happened at Anfield when Man United held Liverpool to a draw could happen to Real Madrid.
This match is very important for Real Madrid to determine their fate in the UCL, they must take advantage of every opportunity and prevent the slightest mistake so as not to lose points at a crucial time.
Honestly I will not underestimate RB Salzburg and Brest, moreover Madrid is still a bit unstable when playing against teams below them. However, because this is the Champions League, at least Ancelotti and his troops understand the atmosphere on the field much better. Talking about the Champions League, the most important thing is the mentality to play until the end, therefore RB Salzburg and Brest must be able to match the mentality of Real Madrid game. That is the only key that other clubs need to prepare when playing against Madrid.
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.
Both of them have experienced a setback in the Champions League but not in the Domestic League, both are in the same central position Real Madrid is leading in LaLiga and RB Salzburg in the Austrian Bundesliga is in fifth position so both seem to focus on the Domestic League rather than the Champions League, but who is favored is still Real Madrid because the quality of the game is very far Real Madrid can score many goals at the Bernabéu Stadium, it is not impossible that RB Salzburg will play well there because there will be some pressure when playing as a guest so I think it is difficult for RB Salzburg to get a win or a draw.