#8 Yaya Toure

Yaya Toure was playing in Belgium as a teenager when his brother Kolo Toure was at Arsenal. Yaya went for training with the Gunners but failed to convince Arsene that he was a midfielder and not a striker.
Toure revealed that he had a chat with Wenger about his playing position during which Wenger told him that he looked more like a striker than a midfielder.
Things however didn't go as planned and once again Wenger was left fuming. The British work permit rules dictated that he had to play either 75 or 90 per cent of international games to get a permit.
A teenage Yaya could not meet the asked criteria and had to return to Belgium before being picked up by Barcelona where he became one of the world's best midfielders in the world. Yaya Toure was the backbone of Manchester City's titles in the PL and would have been a vital transfer to Arsenal.