Thousands of people demonstrating both for and against Catalan independence shut down parts of central Barcelona on Saturday, two days before the anniversary of a vote on secession last year that polarised the wealthy Spanish region.
Taxi drivers have choked main roads and snarled airports, bus and train stations since Saturday.
The World Cup champion and four-times Champions League winner said he feels fit enough to continue playing a little longer.
A day after hundreds of thousands of people marched in Barcelona to demand the release of separatist officials, Mariano Rajoy also urged businesses not to flee the wealthy northern region.
Hundreds of thousands of supporters of a unified Spain filled Barcelona's streets on Sunday in one of the biggest shows of force yet by the so-called silent majority that has watched as regional political leaders push for Catalan independence.
The wealthy region's intention to break away has plunged Spain into its worst political crisis since an attempted military coup in 1981, with Madrid threatening to sack the Catalan government if it goes ahead.
Catalan president Carles Puigdemont arrived at the regional parliament in Barcelona under the glare of cameras from around the world, ready to address lawmakers.