#3 Ricardo Quaresma
The 36-year old is currently plying his trade in the first division of the Turkish league for Kasimpasa. A flamboyant winger known for his trademark outside-the-boot passes and shots, Quaresma's most productive spells came at FC Porto and Besiktas.
He scored 49 goals and provided 56 assists in 216 matches for FC Porto and contributed 38 goals and 78 goals in 227 matches for Besiktas. Undoubtedly capable of the extraordinary, his career has been characterised by a frustrating inconsistency.
He moved to Barça for €6.35 million in July 2003, the same summer that Ronaldo moved to Manchester United. Much was expected of the two promising wingers from Sporting but only Ronaldo kicked on and reached unprecedented heights through sheer hard-work and determination. Quaresma played 28 times for the club, contributing 1 goal and 2 assist in the process. The hierarchy decided that they had seen enough. He was sold to FC Porto for €6 million.
While he didn't achieve as much as he could have on a personal level, he did play an important role in Portgual's Euro 2016 win. His Barça career could become a case-study on what could have been.