Liverpool on Thursday signed Brazil goalkeeper Alisson from Roma in a world record deal valued at 72.5 million euros by the Italian club.
"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 today," said the Liverpool website.
Roma confirmed the value of the transfer for Alisson who featured at the World Cup in Russia.
"ASRoma can confirm that Alisson Becker has completed his move to Liverpool, in a deal that could be worth up to 72.5 million euros," the Serie A club said on Twitter.
Alisson is a key signing for Jurgen Klopp who was desperate for a new goalkeeper to replace Loris Karius following his calamitous Champions League final performance against Real Madrid.
Chelsea was also linked with Alisson who began his career with Internacional before moving to Roma two years ago.
"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," Alisson told liverpoolfc.com.
"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 said that Liverpool striker Mohamed Salah -- also a former Roma player -- had encouraged him to join the Anfield giants.
"Yesterday, he sent me a text message saying: 'Hey, what are you waiting for?' As the negotiations were at an advanced stage, I replied to him straight away saying: 'Calm down, I'm on my way!'"
Alisson becomes Klopp's fourth summer signing after Naby Keita, Fabinho and Xherdan Shaqiri.
The fee beats the previous record for a goalkeeper of 53 million euros paid by Juventus for Gianluigi Buffon in 2001 and the 40 million euros Manchester City forked out to sign Alisson's compatriot Ederson from Benfica last year.
"At one point in the last few weeks it came up, the opportunity to sign one of the world's best goalkeepers -- then it's not a long thought, to be honest, it's only that you need to have a little talk with the owners! They were quite excited, so we did it," said Klopp.
"I think it's something we have to do. He has nothing to do with the price, we have nothing to do with the price, it's the market, that's how it is and we will not think a lot about it.
"It shows the value of goalkeepers, of course, in this moment. 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.
Klopp added: "His English is surprisingly good and he is a real personality. He has meanwhile a lot of experience in the last few years, in Europe and in Rome, he's played there on an outstandingly high level and he did the same at the World Cup."
Klopp was quick, however, to warn fans that Alisson will need time to adapt to life in the Premier League and can still improve further.
"The full package is just good," the coach added.
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