![Artur Mas](http://web.archive.org./web/20150606160111im_/http://ichef.bbci.co.uk/news/270/media/images/77706000/jpg/_77706338_77706337.jpg)
1:21
19 September 2014
19 September 2014 Last updated at 19:39 BST
The Spanish government in Madrid have said a referendum in Catalonia would be illegal under the national constitution.
They have stated they would "take any measure possible" to prevent such a vote taking place, including suspending the powers of the Catalan regional government.
Catalan President Artur Mas has praised the referendum in Scotland and said it was "right" for a similar vote to take place in Catalonia.
Tom Burridge reports.