In 2010, the two nations submitted a bid to organise and host the 2018 finals, which were ultimately awarded to Russia.
Now, the Royal Spanish Football Federation (RFEF) and Portuguese Football Federation (FPF) have announced that work has begun on a joint proposal for the 2030 edition of FIFA's flagship tournament.
🚨OFICIAL🚨 Las Federaciones Española y Portuguesa inician el análisis de una candidatura conjunta para el Mundial de 2030— RFEF (@rfef) June 8, 2019
➡ Los gobiernos de ambos países serán una parte fundamental para su desarrollo
ℹ Más info: https://t.co/9tKAvdnn39 pic.twitter.com/MhB6UE6BQf
No official submission has yet been made, but in statements released on their respective official websites, the organisations confirmed that a review process is underway to assess the possibility of making a bid.
However, there was no mention of Morocco being part of the bid, despite Spanish prime minister Pedro Sanchez stating that such plans were in the offing last November.
A Balkan bid comprising Bulgaria, Greece, Serbia and Romania was touted last year, while a South American bid involving Argentina, Uruguay and Paraguay has been announced.
There is also a feasibility study set to get underway exploring a possible joint bid from England, Northern Ireland, Scotland and Wales.
Morocco said last year they would consider a new campaign to win hosting rights for 2030, having lost out to United States, Canada and Mexico for 2026.