MADRID/COPENHAGEN (Reuters) - Spanish authorities are monitoring borders to make sure that fugitive Catalan separatist leader Carles Puigdemont does not sneak back into Spain to take up the presidency of the regional parliament again, a senior minister said on Tuesday.

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Puigdemont, speaking in Copenhagen, said his return from self-exile to Barcelona would be good for Spanish democracy, but he stopped short of saying if and when he would go home.

Puigdemont has said he can rule from Belgium, where he fled to in October to avoid arrest for his part in organizing an illegal referendum on a split by Catalonia from Spain and a subsequent unilateral declaration of independence.

The Madrid government, however, says no one can be named or rule remotely.

Puigdemont told a news conference in the Danish capital that a huge majority of the Catalan parliament supported him taking up the role of regional president once more following an election in December.

“My return to Barcelona will not only be good news for Catalan people who support our cause but also for Spanish people and Spanish democracy,” he said.

But he did not say exactly when he planned to return to Spain when questioned on the matter.

In Madrid, Spanish Interior Minister Juan Ignacio Zoido said he was worried that the 55-year old -- who faces arrest the minute he steps back in Spain -- could now try to discreetly return to the parliament in Barcelona for a vote on his candidacy.

“We’re making sure this cannot happen, at the borders and within the borders, everywhere,” Zoido told Antena 3 TV. “We’ll make sure he cannot get in, even (hidden) in the boot of a car,” he said.

Catalan lawmakers are set to vote on Puigdemont’s candidacy by Jan. 31.

Puigdemont on Tuesday withdrew a request to be allowed to vote for himself by proxy, a source in his party said, without saying why he had dropped that demand or if it meant he planned to be in parliament in person for the leadership vote.

His visit to Denmark to attend a university debate was his first trip outside Belgium since he arrived there in October following his dismissal by the Madrid government and its imposition of direct rule on the semi-autonomous region.

Spanish Prime Minister Mariano Rajoy called a new regional election in December in a bid to defuse the crisis but his gamble failed when separatist parties won a majority, giving new impetus to the independence movement.

Puigdemont, a former journalist, potentially faces decades in prison in Spain if he is convicted of the charges leveled against him, including rebellion and sedition.

Rajoy has said the Madrid government would appeal to the courts and maintain direct rule of the wealthy northeastern region if Puigdemont was elected while abroad.