#4 Andrew Robertson
One of the bargains of the season, Andrew Robertson joined Liverpool from the relegated Hull City in the summer transfer window of 2017.
He started his life at Anfield slowly and struggled to break into Liverpool's starting line-up until Alberto Moreno's injury in December. The Spaniard's injury gave him the opportunity to impress Jurgen Klopp and he grabbed it with both hands.
Ever since his break-through into the squad, Andrew Robertson is proving to be a revelation and impressed both defensively and in an attacking sense as well. He has provided three assists to his teammates in the PL this season and has completed 21 tackles along with 26 interceptions.
The Scottish international is only in his first season at the club and is likely to improve with time and experience. So, it is safe to say that the former Hull left-back will be going to stay for a long time at the club and could help the club end their defensive woes.