8) Jan Vertonghen
The Belgian turned down a move to Arsenal after Arsene Wenger revealed he could see him being deployed as a defensive midfielder in the future.
Instead he opted for a move to North London rivals Tottenham where he was promised a centre-back role. He has spent a lot of his time at left-back since moving to White Hart Lane, and has even found himself out of the team on occasion.
With Arsenal’s defensive failings recently he would surely be a major figure in Arsenal’s back line by now.