Actually I think real madrid do not show much interest in wining their league, moreover I think they are much interested in wining the champions league this season because their performance in their previous match against real betis was not impressive at all
Losing to Real Betis and dropping to 3rd position in the Spanish La Liga standings as well as trailing league leaders Barcelona by 3 points isn't enough reason for you to think that Real Madrid aren't interested in winning the Spanish La Liga title this season. Real Madrid manager Carlo Ancelotti's expression at full time in that game should tell you he wasn't happy with that result but had to accept it. Real Madrid are very much interested in retaining the league title this season if you ask me and I think they'll continue fighting for till the end of the season.
There is no team that is not interested in winning the title even the main target of a team is to win the league title but Real Madrid's current condition is slumping, the defeat and declining performance of Real Madrid is not surprising because since the beginning of the season they have not found their best performance especially with the many problems faced when many players are injured making Ancelotti has not found a solution for all of that.
Real Madrid will of course fight hard to defend the La Liga title this season but we see it realistically if the competition that occurs this season is quite fierce with Barcelona and Atletico Madrid especially since both competitors have good quality and consistency so I am a little pessimistic about Real Madrid to be able to defend the La Liga title this season.