But Klopp, whose side host Manchester City in a blockbuster clash on Sunday, dismissed talk Liverpool could add the France forward.
"Buying this calibre of player is difficult. I don't see any club at the moment who can buy Kylian Mbappe from PSG," he told the media.
"I don't see any club, that is how it is. And we are involved in the clubs that cannot do it. It is as easy as that.
"Okay, from a sporting point of view, there are not a lot of reasons to not sign him. What a player he is. But it is about the money of course. No chance. Absolutely no chance. Sorry for killing that story."
"We have to play our best game, everybody in the stadium has to be in an absolutely top shape." 👊🔴— Liverpool FC (@LFC) November 8, 2019
Liverpool were quiet during the previous transfer window, opting against adding any new faces to the first team.
Klopp again talked up the importance of keeping his squad together, saying the players he wanted were out of Liverpool's reach financially.
"The players we thought about to make this team better were really expensive and we could not spend the money. That is how it is," he said.
"To see a player better, or with potential to be better or play the same is difficult. That is what it was. That was the situation. It was not that we were not ready, but we did not want to make five or six changes. Not at all. They are at a wonderful age with still space for improvement.
"We wanted to do something and we could have done a lot, but we only wanted to do the right thing. That is the reason we kept this squad because it is really good and if you want to improve it you have to go for the right players, not just some players to fix whatever."
Liverpool hold a six-point lead at the top ahead of the clash against City at Anfield.