Jürgen Klopp defended Liverpool's summer transfer business after saying he would do things differently from high-spending clubs.
Klopp's team paid a world-record goalkeeper fee this summer to sign Roma's Alisson. In January, Virgil van Dijk became the most expensive defender in football when he arrived at Anfield for £ 75m.
But two years ago, while Manchester United had to spend a record £ 89m on Paul Pogba, Klopp had hinted that he would quit the game if those big fees were more the norm than the exception.
"That's the problem these days," said Klopp. "Whatever bulls you say, nobody will forget it, on the other hand it's still true, I could not imagine the world changing that two and a half years ago."
 "One hundred million was a crazy amount of money. Since then, the world has changed completely and we have signed the most expensive keeper and all this stuff.
"We do not care what the world thinks around us, how Man United did not care what I said, it's just an opinion at that moment, did I change my mind? Yes, that's right. But it's better to change your mind than never to have one.
"Whatever people say and bring it over again and again, I had worse days in my life and worse things happen to me. We have the players we wanted. That's fine.
Alisson's arrival follows his compatriot Fabinho's commitment from Monaco, while midfielders Naby Keita from RB Leipzig and Xherdan Shaqiri from Stoke have joined.
Klopp added, "The world has completely changed the players we already have, do not wait around the corner. The world-class goalkeeper, who had a really long contract with Roma, can not be transferred freely.
"It's not my business to say that we do not want to spend a lot of money, because Liverpool will not be successful in the end, it will not work."
Klopp also said that Mohamed Salah from the World Cup without problems.
The Egyptian striker, who scored 44 goals for the Reds last season, suffered a shoulder injury in the Champions League final defeat by Real Madrid.
He recovered to play two games the World Cup for his country, which lost all three group games in Russia
Klopp added: "He has completely recovered." We were in constant contact (during the World Cup) and he was fine, he had no problems.
"He looks very happy and is really happy to be back. It was nice to see him for the first time yesterday, the same for Sadio (mane). You look very fit. "
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