There are frequent reports of Barcelona's desire to sign Antoine Grizmann of Atletico Madrid during the upcoming summer transfer period.
The brother of Grizman, Theo, attended the 2-2 clash on Sunday at the invitation of Barcelona player Samuel Aumetti, his friend and fellow Antoine in the French national team, the newspaper Mundo Deportivo reported.
The newspaper said the presence of Theo for the Clasico, suggests his brother approached the Catalan club.
Barcelona is seeking to pay 100 million euros, the value of the penalty clause in the contract of Grisman, to join him, next summer.
Josep Bartomio, the president of Barcelona, has unveiled his meeting with agent Atletico Madrid in October.