They were selected a party convention held in the Everglades Hotel tonight.
They will be co-opted on to the Assembly to replace outoing MLAs Martina Anderson and Karen Mullan who will stand down in the coming days.
The pair were ousted after an internal party review.
Ciara Ferguson, from Strabane in Co Tyrone, is project manager for the Greater Shantallow Area Partnership community organisation in Derry.
Pádraig Delargy is a 25-year-old party activist from Derry who is a keen advocate of supporting and promoting the Irish language.
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