The information presented here is a summary of the basic rules determining who is entitled to be attributed Portuguese Nationality, who can acquire Portuguese Nationality and who can recoup Portuguese Nationality, in accordance to Portuguese Nationality Law 37/81, of 3rd of October, the relevant revisions of that law and all additional legislation on the subject.

You should be able to find here a solution to your situation. Firstly, it is important to make the distinction between Attribution of Nationality and Acquisition of Nationality.

Portuguese Nationality can be granted by Attribution to people who are entitled to Portuguese Nationality by right, commonly known as Portuguese of Origin, to whomsoever the law recognises as Portuguese of Origin. When granted by Attribution, Portuguese Nationality is backdated to the date of birth and produces effect from the date of birth.

Portuguese Nationality can be granted by Acquisition to people of all other categories. When granted by Acquisition, Portuguese Nationality produces effect from the date of grant.