Carles Puigdemont is due to address the Catalan Parliament this afternoon in a highly anticipated speech which is expected to feature a declaration of independence.
But exactly what sovereignty for the northeastern region will mean remains to be seen.
Some separatist groups are calling for a hard approach, which could see Catalonia unilaterally declare independence and completely break from Spain.
Others would prefer to see a gradual split, and some would be reportedly happy with a symbolic secession, with independence in name only.
Spain is facing a constitutional crisis as Madrid has consistently branded the referendum illegal and has refused to even consider the possibility of secession.
Nearly 900 people were hurt in clashes with heavily armed Spanish national police during the ballot on October 1.
Of those who voted, 90 per cent reportedly backed independence.
Madrid has since issued Catalans a formal apology for the heavy-handed tactics of some of its officers who were deployed to the region to close polling stations and stop people from voting.