In 2007, Moralez was called for the Argentina under-20 squad for the South American Youth Championship held in Paraguay. Later that year he was part of Argentina FIFA W-20 World Cup title winning team. He played along Sergio Agüero and Mauro Zárate in the attack. Moralez was third highest scorer in the tournament (bronze shoe) and was named second best player (silver ball), behind his teammate Agüero.