#6 Piotr Zielinski (Napoli)
Piotr Zielinski is a 24-year-old central midfielder who currently plays for Napoli in Serie A. He also plays for Poland's national team, having made 41 appearances since his debut in June 2013.
Zielinski plays a pivotal role in the Napoli midfield and has appeared 27 times for them in the league thus far, picking up 4 goals in the process. He's agile, relatively quick, and has an eye for goal that leaves opposition defences troubled, as they never know whether he's going to set up another player for goal, or go for it himself. Either way, he's a real threat.
The Polish international is both affordable and would fit well in the first team, offering Klopp more options in the midfield, especially where agility is concerned.
Again, there is no concrete price tag for Zielinski, but Liverpool would be looking, realistically, at around £40m to acquire his services.