The Brazil worldwide 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".
The Brazilian will reportedly earn £5.3m a year - another sign of Klopp and FSG's willingness to splash the cash in order to get their preferred targets.
Alisson will be reunited with his former teammate Mohamed Salah, whom Liverpool bought from Roma for £38m last summer, and the goalkeeper revealed the Egyptian urged him to move to Anfield. He spent the first season as Wojciech Szczesny's back-up and did not play a league game. "It will happen a lot in the next few weeks I guess and that's it, so we are really happy to have him here now". As well as being a great player, he is a huge character and a great person - which is the most important thing.
And the German admits once it became clear that Alisson was available then the deal was a no brainer.
'To be with these great people and players day to day is fantastic for me'.
"The full package is just good", he added. We didn't sign him because he is good looking and a nice fella and his English is good and all that stuff - we signed him obviously because he is a world-class goalkeeper.
"It shows the value of goalkeepers, of course, in this moment".
The deal, believed to be worth £68M, smashes the world record for a goalkeeper in football.
Alisson had a strong season with Italian side AS Roma and played a vital role in their run to the Champions League semi finals.
Klopp claimed he encountered little resistance from the Liverpool hierarchy in splurging on a highly rated replacement for the much-maligned Loris Karius.
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