Pique, who has previously been targeted by Spain supporters because of his feelings on the issue, said he would stand down from global duty if his presence caused a problem for the team.
Boya said "Oct. 9 will be the session to declare the independence of Catalonia".
Where is the Spanish king in all this?
His criticism of the king showed that he was "out of touch with reality", it added.
Carles Puigdemont, president of Catalonia's regional government, has offered his support to protesters.
The European Parliament will hold a special debate on Wednesday on the issue.
Switching to Spanish from Catalan, he thanked Spanish citizens who had sent their "solidarity" to Catalonia.
Given the police violence that marred Sunday's poll, leaving hundreds of people injured, such a move would go down extremely badly.
Police used batons and fired rubber bullets during pro-referendum protests in Barcelona, and Spain's Deputy Prime Minister Soraya Saenz de Santamaria said police had "acted with professionalism and in a proportionate way".
Dr Ramon Pardo, a senior lecturer in worldwide relations at King's College London has told Express.co.uk it is now a question of how, and not if, Catalonia will declare independence.
'They have placed themselves totally outside the law and democracy, ' he said of the Catalan leadership.
Patricia, 38, was one of the voters who were attacked by police.
Spain has been pushed to the brink by the independence referendum after it was condemned by senior politicians in Madrid and by King Felipe.
"While that's the position of Spain, I understand that, you can not simply ignore the kind of strength of feeling that we've seen expressed". "Why not love them all?"