Jurgen Klopp claims that UEFA must punish Manchester City if it broke the rules of financial fair play.
According to e-mails viewed by Der Speigel, the city would have bypassed the regulations by manipulating contracts with sponsors to increase the club's revenues.
Liverpool owners Fenway Sports Group are suspicious of the agreement between City and some of their sponsors, who have links with their owner, Sheikh Mansour.
Klopp claims that he has not studied the accusations, but that UEFA must act if its rules on FFP have been flouted.
"I've heard about Der Spiegel's story, but I have not read it yet," said the Liverpool boss.
"It's really hard to comment, but what I can say in general is that the FFP is a very good thing. But we always thought that.
"If it's in place, they have to do something about it. I have no idea what's going on. I know this obviously concerns Paris and Man City.
"I do not know if we're talking about other clubs as well. That's all I can say. I think FFP is a very good thing because it sets the rules and that sort of thing.
"If everything is fine, then everything is fine. If not, then someone should do something. "
Klopp's team will face Fulham on Sunday, two points from the top of the leaderboard, City.
On Friday, Klopp said that he thought his team's season would only be considered a success in some quarters as he beat Guardiola's men under the title.
"It seems to me that this season will be a success only by the questions that are asked if we become champions," he said.
"This is a season where our competitors are the champions of last year, the champions of two years ago, a renewed Arsenal, a more experienced Tottenham, Man United and all the rest.
"It's a really difficult job. It's not a problem and we aim for everything.
"We are really ambitious. Whatever we can get, we want to take. But as we were in the final of the Champions League last season and the new recruits, it seems that we should automatically win the Champions League or the Premier League. "