Keita, a Guinea international, will move to Liverpool on July 1 after the Reds struck an agreement with RB Leipzig last summer.
According to the Liverpool Echo, the REd deal included an agreement that the final price will depend on whether Leipzig finishes the 2017/18 season in Bundesliga.
The report claims that Champions League qualification was set to guarantee a £59m fee, while Europe League spot would see the German outfits earn £52.75m, and no European football would have cost Liverpool £48m.
Leipzig finished sixth this season in Bundesliga, securing a Europa League football, which means that Liverpool will have to shell out £52.75m.
The Guinea international midfielder has made 39 appearances this campaign, founding the net nine times and registering seven assists in the process.
Meanwhile, another RB Leipzig player Timo Werner could make a switch to Liverpool with Jurgen Klopp plans to add attacking options for the next season to challenge Manchester City for the Premier League title.