"It's so awful a scenario the idea of independence, that everything won't work from the single moment from which independence is declared", Nadal said in a Bloomberg Television interview.
France, which borders Catalonia, said on Monday it would not recognize a unilateral independence declaration.
According to Barcelona's local police, Guardia Urbana, around 5,500 people gathered in city council square, Sant Jaume, while in Madrid, around 100 people gathered in Plaza Cibeles, the city council square.
"The Spanish Government have a postion about the legality of this referendum which you're all aware of".
Spain's government insists the country will not be divided as pressure grows on the Catalan regional government after a huge march in Barcelona against independence. The referendum, and resulting police crackdown, is a hot topic of conversation around the food stalls.
Mr Rajoy has repeatedly said he will not talk to Catalan leaders unless they drop plans for independence, and has refused to acknowledge it as a legitimate possibility.
Other companies are reportedly considering leaving Catalonia to avoid being forced to leave the European Union and the single market in the case of secession. The impact on the region could grow with a knock-on effect on banks' various subsidiaries, insurers and property firms. The EU's silence over the violent scenes during the contested vote prompted some - including former Presiding Officer Tricia Marwick - to renounce their former backing for membership.
Spain has been rocked by the referendum results and the police violence seen against voters in Catalonia has sparked a huge backlash. Allowing Catalonia to separate would open the floodgates for other independence movements, potentially turning Europe into a piecemeal puzzle of borders.
Taking control of the governance of Catalonia is one of the tools that conservative Spanish Prime Minister Mariano Rajoy said the central government would contemplate to deal with the political crisis.
Tens of thousands of people took to the streets of Catalonia's capital Barcelona on October 8 to express their opposition to any declaration of independence from Spain.
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