Even though Real Madrid have a long history in the UCL and have won 15 trophies, it doesn't mean they are unbeatable. Real Madrid just lost points at Espanyol's headquarters in the continuation of La Liga, the negative result had a little impact on their mentality as they were preparing to face Man City who were much stronger than the team that had just beaten them.
This match is like a final for both teams, although Real Madrid are favorites, Man City can also provide a surprise.
True they are not like unbeatable, every team can be beaten even by the list team you expect but for the case of Mancity , I still don't think they will beat them and it's somehow obvious to me after what they played against PSG.
Not saying they can't though but if they eventually beat Madrid( considering squads and likes) then they stand to finish among the top 5 this season.. it will be hard to take out Liverpool anyway but they also stand a chance to win the title as well if they bear Madrid .
Liverpool has performed well in the English Premier League since the beginning and Liverpool won all the matches in the Champions League so no team will take Liverpool lightly. Although Liverpool is in a strong position in the Champions League, Real Madrid is not to be taken lightly. Real Madrid is one of the favorites for the Champions League and how they have performed in the past is unknown to us. No matter how bad Real Madrid has been performing recently, every top team must consider Real Madrid as a tough opponent. For example, Real Madrid has a match against Manchester City in the Champions League, some supporters say that Real Madrid will win, and some football fans say that Manchester City will win, but if we consider the performance, then Real Madrid should be ahead.
If Real Madrid can win their next Champions League match against Manchester City, Real Madrid's next journey will be easier.