Does Aussies's need an apostrophe

If it's one Aussie - the Word is Aussie's - as in "The Aussie's dropped he ball again". If it's more than one Aussie - the apostrophe is 'implied' - as in "The Aussies lost again"

Aussies's can have an apostrophe but there shouldn't be an s after the apostrophe.

Aussie's is the possessive singular form of Aussie. eg The Aussie's dog is missing. - here - 's - shows the dog belongs to the Aussie (one Aussie).

Aussies is the plural form of Aussie and means more than one. eg The Aussies lost the game.

Aussies' is the plural possessive form of Aussie. eg The Aussies' fullback was hopeless.

There is no implied apostrophe.