Barcelona president Josep Maria Bartomeu has said he would contact Real Madrid chief Florentino Perez before attempting to sign the unsettled Isco.
The midfielder has fallen from grace at the Santiago Bernabeu, having not started a La Liga game for the club in more than three months.
This has seen a number of clubs express an interest in the player, who has been reduced to a peripheral role at Madrid.
Ahead of Madrid's visit to the Nou Camp in the first leg of the Copa del Rey semi-final, Bartomeu has opened up on how the Catalan giants would go about trying to bring in a player from their long-term rivals.
"If our coaches asked us for a player and they want to leave Madrid, of course we would sign them," Bartomeu told El Partidazo de COPE.
"But it has not happened since I'm here.
"There are no non-aggression pacts. Each one tries to make their team more competitive.
"Isco? For the sake of Real Madrid I would speak with the president of Real Madrid."
