"At one point in the last few weeks it came up, the opportunity to sign one of the world's best goalkeepers", he said.
He arrives to strengthen the goalkeeping position, with Liverpool having looked to upgrade after some unconvincing showings from Loris Karius and Simon Mignolet.
"[The owners] were quite excited, so we did it", the Reds boss told his club's official website.
"It shows the value of goalkeepers, of course, in this moment".
We have everything we need for the next season, because I don't think we will do anything more [in the market].
The Reds have now broken world records for the highest fees spent on a goalkeeper and a defender in the a year ago. "The full package is just good". The fee for Alisson is a record for a goalkeeper, eclipsing the €53mn paid by Juventus for Gianluigi Buffon in 2001 and the €40mn it cost Manchester City to buy Ederson from Benfica last summer.
The 25-year-old, who now plays for Roma in Italy, is cutting short his vacation to undergo a medical on Merseyside after being given permission to talk to Liverpool.
Signing the highly-rated 'keeper for £66.6milllion, the German has made clear his ambition ahead of the 2018/19 season and sent out a warning to his Premier League rivals.
"But of course he still has to adapt and age-wise he can improve, the best years are coming in the goalkeeper life, so it's all good".