#1 Shkodran Mustafi
Mustafi signed a five-year deal at Valencia in August 2014 and moved to Arsenal for a reported £35 million two years later. Many Gunners were excited to see the German centre-back but he has been disappointing so far. One doesn't need to be a pundit to know that Arsenal's defence has let them down this season and Mustafi has arguably been the main culprit.
The German's decision making has been absolutely shocking, and right now Arsenal can't really afford to keep passengers in their squad.
Edited by Aniket Kar