Several thousand Barcelona fans at Camp Nou chanted Lionel Messi's name in the 10th minute of the Copa del Rey semi-final Clasico on Wednesday.
The Barcelona club legend and all-time top goalscorer, currently at Paris Saint-Germain, is likely to leave the French side at the end of his contract in June, a club source said on Tuesday.
Some fans sung Messi's name outside the stadium before the clash with Real Madrid and many joined in after 10 minutes of the match, representing the Argentine's shirt number at Barca.
"Messi is living history at Barcelona, he's the best player in the history of football," said sporting director Mateu Alemany before the Clasico on Wednesday.
"He's at PSG fighting for titles and we are fighting for ours. In the future we'll see what happens."
World Cup winner Messi, who will turn 36 in June, joined PSG in 2021 on a two-year deal which expires at the end of this campaign.