Liverpool are still searching for one or two more players in the current transfer window, and there has been speculation that a big-money signing might yet be incoming.
The Reds are usually one of the top gross spenders in the Premier League and have often been comfortable spending tens of millions of pounds on a single player.
But how successful have they been with these biggest signings of all? Here's a run-down of the 20 most expensive Liverpool signings of all time, with a look at how they got on in their time at Anfield.
For consistency, all transfer fees taken from LFChistory.net, with special thanks to Arnie Baldursson.
Gradings (from A, highest, to E, lowest) are yielded based on pre-arrival expectation, achievement at the club, value for money and any fees recouped.