The 23-year-old has put in a series of impressive displays since arriving, but were Liverpool ripped off?
A renowned research group claim Liverpool paid over the odds for Naby Keita after releasing figures from the summer transfer window.
The CIES Football Observatory specialises in the statistical analysis of football and has broken down the summer’s biggest deals.
But some of the findings are startling with Liverpool fans likely to disagree with the news they paid too much for Keita.
Yet according to the study the Reds shelled €8.7m over his fair price.
Interestingly, Liverpool didn’t pay over the odds for Allison. The results show Jurgen Klopp’s side got the Brazil shot-stopper €6.8m under his fair price.
From a buying club’s perspective, Real Madrid apparently got the best deal of the window in Thibaut Courtois. The Belgian shot-stopper’s fair price is at €62.6million, some €22.6m more than what he was sold for.
And it’s more bad news for Chelsea who paid a staggering €44.7m too much for Kepa Arrizabalaga.
In the study, players have been listed next to three columns – ‘A’, ‘B’ and ‘C’.
Column ‘A’ refers to the reported price they were sold for (in Euros). ‘B’ is the fair price – what their research shows the fee should have been. ‘C’ is the difference of ‘A’ and ‘B’.
According to the CIES Football Observatory, the fair price ‘corresponds to the average between the estimated cost for the most likely buyer before the transfer and the current transfer value’.