The former Atletico Madrid captain said: "I know the fans enjoyed the hat-trick and so did I.
"It was fantastic to score in front of the Kop. I am very comfortable playing here and I am very, very happy with my first hat-trick at this ground. It is important though, that we win titles. I would prefer to be remembered for the titles rather than my goals.
"I would prefer that more than anything else, and I am happy with the way I have learned to cope with the physical side of the English game. When I was in Madrid and watching English games on TV, I could see how difficult it would be to play here.
"There are so many strong defenders. But I have settled, I have scored goals and I have coped with the physical side. Even if it is true that I would not be getting hit in the back all the time in Spain!
"But I have scored 21 goals already, and we have a minimum of 14 games more in the Premier League and the Champions League, and I aim to score a lot more.
"It has been a very good season for me already, and yes, I would be happy now with 30, but I am more happy when the team wins. I have not won anything yet, just for the under-18s and under-19s in Madrid. It is a long time ago and I have come to Liverpool to win things.
"My target is titles, not just goals. I don't know when, this season or the next but I will want that.
"I hope I stay here for a long time. I have a six-year contract so I have every intention of being here a long time, and if everything continues okay maybe I will want to sign for more."