Portugal - Passport & Nationality - Naturalisation by Birth
he/she has completed the 1st cycle of basic education in Portuguese territory; OR
has been residing in Portugal for a period of 10 years or more; OR
one of the parents has been residing in Portugal for a period of 5 years or more;
but only if:
he/she has sufficient knowledge of the Portuguese language; AND
he/she has not been convicted for a crime punished with imprisonment for 3 or more years.