Angel Di Maria appeared to shout "f*** off" at the Manchester United fans moments after Paris Saint-Germain took the lead at Old Trafford.
The Argentine, who used to play for the Red Devils, received some mild jeering from his former fans on the night and decided to respond after Presnel Kimpembe opened the scoring.
BT Sport cameras showed the PSG players gathered together celebrating the goal by the touchline as Di Maria stared in the direction of the home fans.
He could then be seen shouting at them, and appeared to say "f*** off" as well as "p***" - the Spanish word for "b****".
Hundreds of fans took to social media to point out that they had seen the words coming from the mouth of the PSG man.
The game resumed but moments later Di Maria had a bottle - which came in the direction of the home supporters - thrown at him.
This wasn't the only incident from the match the Argentine was involved in on Tuesday.
The 30-year-old forward was also thrown into the stand by Man United's Ashley Young after a collision towards the end of the first half.
The pair were chasing a loose ball down the touchline when Young gave Di Maria a shoulder charge which sent him flying off the side of the pitch and into the metal barrier surrounding the pitch.
His team-mates leaped to his defence by confronting Young, whilst Di Maria was eventually able to return to the field after receiving treatment on his left arm, specifically around his elbow.
He had a hefty landing on the concrete perimeter to the Old Trafford pitch, but Young, already on a booking, was not punished further by the referee.
arifk17
395
🇦🇷 Angel Di Maria vs @ManUtd: 🎯 2 Assists 🍺 1 Beer 🤷♂ How to mark your return to Old Trafford.
Humancalculator
327
He probably got a bit crazy by the sip he took on the beer bottle thrown at him.
ViveLeRouge
293
You can hear ManU fans booing him when he was pushed by Ashley Young near the sidelines, so I sorta understand why he wants to do that. Still unprofessional, but understandable.
Min_11
248
I dnt understand why utd fans hate di maria so much, it was not his fault, he was simply not given time to adapt. Now the saw his class..no reason to hate
cuwcdsz
247
It’s funny cause when psg played Barca in the ucl for the comeback when cavani scored at the camp nou he said the same thing at the Barca fans just before the comeback happened. Don’t worry United you guys got this
Yuuadi
234
Disrespect from our fans. Unacceptable behaviour to such a wonderful player. Just cuz he didnt work out at us doesnt mean he deserves disrespect.