Antoine Griezmann was seen jetting out of Barcelona just moments after a furious expletive-ridden spat with Gerard Pique.
It came not long after Paris Saint-Germain inflicted a 4-1 defeat on them at the Nou Camp on Tuesday night.
Kylian Mbappe was in jaw-dropping form as he netted a hat-trick.
It means Barcelona have it all to do in the return leg next month while Ronald Koeman has come under huge pressure as a result.
But not just the coach is feeling the heat with tempers flaring up on the pitch.
With the scores tied at 1-1, Pique could be heard screaming at his team-mates in the 39th minute after PSG won a corner.
The defender, who had just returned from injury, was furious with the lack of possession the home side had.
"Not one f***ing long spell of possession, for f*** sake. F***ing hell! Come on," Pique barked.
Griezmann replied: "Relax! Stop yelling! Your mother’s ****."
The Spaniard hit back: "‘No Grizzi, your mother’s ****. We are suffering and running like crazy people. We’ve been like this for five minutes!"
The striker responded: "Don’t yell at me! I’m also suffering! I also run like crazy!"
Marc-Andre ter Stegen and Clement Lenglet were spotted trying to calm them both down.
Barcelona would go on to concede three more times in the second-half, two from Mbappe - playing Los Cules for the first time in his career.
As for Griezmann, he was spotted leaving Barcelona via the city's El Prat airport, where he boarded a private jet.
Reporters mobbed the Frenchman as he made his way through the terminal, asking him where he was going.
Griezmann refused to give much comment, saying: "Why does it matter to you?"
However, Spain are under strict Covid guidelines at the moment and are only allowed to make vital journeys as well as adhere to a 10pm curfew.
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