4. Marko Marin
The (former) German international was held in high regard when he joined the club two summers ago, but he struggled to make an impact at the club and after only 15 appearances in his maiden campaign he was shipped off to Spain in order to salvage his career that had unexpectedly hit the rocks so early on. A year in Sevilla doesn’t seen to have done him as many favours as he’d hoped, featuring just 30 times across all competitions and scoring twice, but with the Blues’s continued expansion there is seemingly less and less room for him in the current set up.