Croatian Academy Football League

The Croatian Academy Football League is the top level of youth football in Croatia. It is contested by academy teams of First League clubs and is organised by the Croatian Football Federation.

Since its inception in 1991, and with the exception of 2014–15 when U19 league was not played, the youth league has been contested in two age categories and from 2014-15 three age categories:

  The club won the senior Prva HNL and all youth level league titles in the same season.

...
Wikipedia