LONDON, July 19 -- Liverpool have completed the signing of Brazil goalkeeper Alisson Becker from AS Roma, the English Premier League side announced on Thursday.

The 25-year-old signed a long-term contract with the Reds after undergoing a medical and completing the formalities of his switch at Melwood.

The Brazil international said to the club's official website: "I'm really happy, it's a dream come true to wear such a prestigious shirt for a club of this size that is used to always winning.

"In terms of my life and my career, it's a huge step for me being part of this club and this family.

"You can be certain that I'll give my all."

Alisson, who began his career with Internacional in his homeland, was Brazil's No. 1 at the World Cup in Russia this summer.