5) Danilo Pereira - FC Porto
Liverpool's existing issues at the back are as much down to the lack of an out-and-out defensive midfielder as a shoddy back-line. Henderson especially has come under scrutiny from the Liverpool faithful for failing to do the basics right and break down opposition possession.
Therefore, if it is an explosive, strong and primarily defensively-focused midfielder that Liverpool and Klopp want then they should look no further than Porto's Pereira.
Danilo is a powerful central midfielder, capable of getting from one box to another quickly and efficiently. He is the unsung hero of Porto, who likes to dictate the game, sitting back and protecting the defence.
The 26-year-old is in his peak and if Porto are to resume their tradition of selling top starlets for big bucks, now would be the time to do so.