"This is a big challenge for me and I know I have made a big decision to move so far away from home at such a young age," said the young defender.
"But it was an opportunity I couldn't turn down because this is a great club with a great manager.
"I'm really excited about my future with Liverpool. I watched the Premiership on TV when I was in Argentina and I know what a great opportunity this is for me.
"I know all about the club's history but the important thing now is the future and I'm delighted to be a part of it.
"I consider myself to be a player for the future because I know I have a lot to learn, but at the same time I also want to challenge for a first team place as soon as possible to show the fans what I can do."