Madrid issued a European arrest warrant for Puigdemont and four of his former ministers after they fled to Brussels last month and ignored a summons to appear before a Spanish judge, claiming they would not get a fair trial.
A judge in Brussels will hear arguments behind closed doors from prosecutors and lawyers for the Catalan separatists over Spain's extradition request in the first round of what could become a protracted courtroom battle, with both sides expected to appeal if they lose.
"We are going to ask the Belgian judge to respect fundamental EU rights," Michele Hirsch, a lawyer for two of the ex-ministers told AFP.
"The act of organising a referendum is not a matter for criminal law. It is clearly a political opinion that is being targeted, and the peaceful and democratic execution of a series of events linked to that opinion."
The hearing is the latest act in Spain's biggest political crisis in decades, sparked by a banned October 1 referendum that the Catalan parliament then used as a mandate to declare independence.
The five who fled to Brussels went to a Belgian police station on November 5 to answer the warrant and were freed that evening after hours of questioning, on condition that they agreed not to leave Belgium.
Under Belgian law a decision on a European arrest warrant -- brought in by the EU to speed up the once-lengthy extradition process in the bloc -- should be made within 60 days.
The judge is expected to give an initial judgement in eight to 10 days.
But at the weekend the country's justice minister warned that with appeals, the process could last up to three months.
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