When Manchester United signed Paul Pogba in 2016, Klopp was critical and adamant he would "even do it differently if I could spend that money".

But since then, Liverpool has made Virgil van Dijk and Alisson the most expensive defender and goalkeeper of all time, while the club have also spent more than £40 million ($71.4 million) each on Mohamed Salah, Naby Keita and Fabinho.

After the signing of Alisson on Friday (AEST), Klopp's 2016 quotes resurfaced and were put to him in a news conference, drawing a fiery response.

"That's a problem, whatever b******t you say, no one will forget it," Klopp said on Sunday (AEST).

"It's still kind of true. I couldn't have imagined the world could have changed. £100 million [for Pogba] was a crazy number, but since then the world changed.

"We signed the most expensive goalkeeper, there will be a few nice transfers [made by other clubs]. It's not about pushing through my thoughts on that and not paying big money, if Liverpool aren't successful we have to work.

"To improve a squad like this costs money. So far it's a really good year for us, pretty successful last year.

"Still we need to replace players — Emre Can left, good business bringing Fabinho in. [Xherdan] Shaqiri, we saw him play in the [FIFA] World Cup. I know Stoke [City] were relegated, but he had a lot of good games.

"We don't care what the world think, like Manchester United didn't care what I thought."