The reaction in Israel was markedly different.
Israeli Defense Minister Israel Katz issued a sharp public statement condemning the gesture, calling on Barcelona to formally distance itself from what he described as incitement. "Lamine Yamal chose to incite against Israel and encourage hatred at a time when our soldiers are fighting the terrorist organization Hamas," Katz wrote, referring to Hamas as an organization that "massacred, raped, burned and murdered children, women and elderly Jews on October 7."
He added: "Anyone who supports such messages should ask themselves: is this humanitarian in their eyes? Is this morality?"
Katz concluded with a direct demand: "I expect a large and respected club like Barcelona to denounce these things and make it unequivocally clear that there is no place for incitement and support for terrorism."
Barcelona's response, so far, has been muted. Coach Hansi Flick addressed reporters on Tuesday, saying he had spoken with Yamal but ultimately deferred to the player's autonomy: "I said if he wants this, it is his decision. He is old enough. He's 18 years old." The club itself has made no official statement.
Israeli Barcelona fan club Barcamania Israel called the gesture "stupid and irresponsible" and said it had filed a complaint with the club.
The incident comes just a month before the World Cup kicks off in the United States, Canada, and Mexico, a tournament at which Yamal is widely expected to be one of the marquee stars. FIFA regulations explicitly prohibit political expression on team equipment and in stadiums, though the consistency of their enforcement has long been disputed.
The club's silence, for now, says everything we need to know.