"Liverpool are a club with an impressive history, with lots of success," he said.
"In England they are the team with the most titles, so I've already experienced that pressure and I hope that will help me now with this challenge, which is clearly the biggest in my career.
"I think I've become a better footballer and also matured. When you play at a club like Liverpool you have the chance to play with great players, I've also been called up by Spain and we've won the European Championships, so in these years I've learned a huge amount.
"It's made me a much better player and I hope to be able to show it, which in the end is the important thing."
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