Benjamin Mendy taunted Liverpool by wildly celebrating Barcelona's win from the Nou Camp stands.
The Manchester City defender was invited to Spain to watch the Champions League semi-final by fellow Frenchmen and Barcelona stars Samuel Umtiti and Ousmane Dembele.
Mendy was filmed celebrating one of the home side's three goals against Man City's fierce title rivals with his middle fingers.
Liverpool's dreams of reaching a second consecutive Champions League final were dealt a hammer blow in Barcelona on Wednesday night.
Former Reds striker Luis Suarez kick-started the rout against his old team before Lionel Messi pretty much killed the contest in the first leg.
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The Argentine netted a simple tap-in to make it two after a Suarez effort rebounded off the crossbar and into his path.
His second was a moment of genius in which he fired home a free-kick, beating Alisson all ends up from around 35 yards.
Alisson 'defied Jurgen Klopp's orders' during Liverpool defeat to Barcelona
Messi spoke to Movistar Plus after the game where he came to the defence of his team-mate Philippe Coutinho.
"We are in a defining moment and it is not time to criticize anyone," said Messi.
Gary Lineker and Rio Ferdinand slammed by Liverpool fans for reaction to Lionel Messi goal
"It is time to make everything happen as we talked at the beginning of the season.
"It is ugly to see a team-mate get booed like that, we must all be together and support."
