Mezue ahịrịokwu na-esonụ: N'afọ 2014, Casella mere ihe mbụ ya maka Argentina, na-anọchite anya ndị otu egwuregwu mba U-18, na asọmpi asọmpi maka 2014 Summer Youth Olympics. N'asọmpi ahụ, ndị Argentina bịara n'ọkwa mbụ, ebe Casella gbara goolu iri na asatọ. Ọ nọchitere anya ndị otu egwuregwu mba nke ndị na-eto eto na Pan American Junior Championship na Toronto, Canada. N'asọmpi ahụ, o nyere goolu iri na asatọ, na-enyere Argentina aka inweta ihe nrite ọlaedo na iru eru na Junior World Cup. Casella nọchitere anya Argentina ọzọ na
Junior World Cup na Lucknow, India, ebe ndị otu ha gbara nke ise.