Confirming the news to the Official Club Website, Town boss Joe Royle said: "The original idea was for Sito to have an intensive weekend training but there is now a chance he could be involved against Cardiff.
"His signing has not been completed yet and there is paperwork to be done so it's a race against time to see if we can get it all sorted out in time."
Should Sito be registered in time, he will line-up with the number 15 shirt for Town.