The starting line-up Arsenal could’ve had

 Cicinho

Arsenal were amongst several top clubs after the young brazilian  from Sao Paulo but it was not to be and Madrid scooped the player. He is not nearly as illustrious as the other men on this list, but worth mentioning nonetheless. He eventually tailed off in form but what a talent he was at one point. He was one of the original wing backs and could have been useful for Arsenal.