Rankings like this often prove decisive, so I implemented some ground rules to firstly enable me to get the list down 20, and secondly to provide justification for the inclusion and/or exclusion of certain players.
I decided that the players had to be a regular feature in their first team's match day squad, meaning wonderful talents like Gerard Deulofeu, Oliver Torres, Jose Rodriguez, Alvaro Morata and Jose Campana weren't eligible.
I also decided that loan players from other leagues could be included, after all they are playing in La Liga at the moment.
However loan players in foreign leagues, such as Isaac Cuenca for Ajax, would not be as they are not currently playing in La Liga.
Work your way down to find out who are the most exciting youngsters in Spain's Primera Division...