#4 Nathaniel Clyne
When Liverpool signed Nathaniel Clyne from Southampton, he looked like the real deal and a mainstay in the Reds defence for many years to come. He was arguably Liverpool's most consistent player in his first season at the club. Defensively sound and not too bad in attack is exactly how a full-back should be.
Clyne remained consistent but frustrating at times, due to his lack of ability in attack. He still kept his spot in Liverpool's starting line-up. However, a back injury at the start of the 2017-18 season caused him to miss a large chunk of the season. He only played a couple of matches towards the end of the season.
Clyne has been leapfrogged by Joe Gomez, who is naturally a centre-back, and talented youngster Trent Alexander-Arnold. He might not be able to return to the first choice eleven for Liverpool. The recent arrival of defensive midfielder Fabinho, who can also play at right-back would give Clyne another reason to leave Liverpool. Versatility is good for depth.