#2 Ibrahim Afellay
When he arrived at Barcelona in 2011, Ibrahim Afellay was one of the most promising prospects who had emerged out of the Netherlands with PSV Eindhoven. However, the player's career went down the wrong path as he managed to get only 35 appearances for the club in his four-year tenure at the club, scoring only twice!
On top of that, he also served dismal loan spells at Schalke and Olympiakos. With Barcelona signing Neymar and Suarez during his loan spells with the aforementioned clubs, the Dutchman stood no chance of becoming a regular ahead of the two giants. As a result, he left for Stoke City on a free in 2015 and has been there ever since.
Had he been given a chance, there's no doubt Ibrahim Afellay would have made the most of it.