That's quite an ambitious target that Liverpool has to achieve the quadruple, of course they have to really focus in every competition they participate in. In the FA Cup, of course there are many strong teams that still have to be taken into account, so perhaps Liverpool's path to targeting the FA Cup Trophy will be quite difficult. In the Premier League, the competition is also quite difficult so they will need consistency in their performance to succeed in becoming champions this season. Of course, Liverpool is the favorite in the European League, but to become champions they also need a lot of effort because the European League is still in the round of 16 and they have to go through many stages.
A quadruple would be the best parting gift for Klopp. I think all the players want to give a farewell gift to the coach who has spent 9 seasons with Liverpool. This will be a big motivation for all Liverpool players. If you look at the statistics and data on paper, I think Liverpool does have a chance to make the Quadruple happen. They are the favorite team in the FA and European Leagues. They are indeed having a little difficulty in the Premier League because they are competing closely with City, but if they are able to maintain the consistency of their game and beat City when they meet in March then it will be a Quadruple for Liverpool.
It is not easy to maintain consistency at all front. At one point Liverpool has to consider which is important to them and let go of others. Their players are getting injured lately because of the work rate. They are not having enough squad dept to compete till the end and talk of quadruple. Let's be realistic here, Liverpool wouldn't have won if they played a proper team like Manchester City, Arsenal or Aston Villa with this set of players, they would have lost the match.