#3 Lucas Silva - Rare Heart Condition
After failing the medical test at Sporting Lisbon with a condition known as cardiac arrhythmia, Lucas Silva's career came down to a halt and was forced to sit up on the bench for most of the time. However, upon his return to Real Madrid, he was sent to Ligue 1, where he played for Marseille and later to the Brazilian side Cruzeiro.
Silva was yet another promising player, whose talents exceeded far beyond the expectations of both the managers and the players. He was discovered with this condition extremely late in his career but was known to have been carrying it for a very long time. However, his will to recover and return to his side was extremely high. Upon his full recovery, he didn't play directly for Los Blancos, as he made moves to France and later Brazil.
Though he is fit to play, the heart disease still persists.