Liverpool fans are convinced captain Jordan Henderson told Villarreal's Juan Foyth to 'shut the f**k up" after he tried to square up to Jurgen Klopp.
The Reds emerged 2-0 winners from the first leg of their Champions League semi-final tie on Wednesday evening.
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At full-time, Klopp came onto the pitch and smiled at Foyth who appeared to be approaching him.
The former Tottenham Hotspur man didn't take it well and the pair exchanged words on the touchline minutes later.
Backup goalkeeper Adrian can be seen holding Foyth while Trent Alexander-Arnold and Henderson stand in front of Klopp.
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Henderson then appears to mouth 'shut the f**k up' while locking eyes with his opponent.
Supporters have reacted to the incident and they think it's the perfect example of leadership on the pitch.
One commented: "I like the wall that quickly gets set up by the lads to stop him getting to Jurgen. Respect for the gaffer."
Another said: "Trent’s just like 'lol mate, give yer a head a wobble.'"
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A third tweeted: "Still pressing after the whistle, my captain."
While someone else posted: "Henderson telling Foyth to 'shut the f**k up' is a highlight."
It was Henderson who played a part in opening the scoring at Anfield in the second half after a tight first 45.
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The England international's attempted cross hit Pervis Estupinan and looped over goalkeeper Geronimo Rulli, who could only get a hand to it.
Sadio Mane doubled Liverpool's lead two minutes later after latching onto a Mohamed Salah pass and beating the offside trap by inches.
Villarreal didn't have a single shot on target and Unai Emery's side have it all to do in the return leg out in Spain next Tuesday.
Klopp insists a 2-0 lead isn't enough however and called it 'dangerous' at halftime of the tie.
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"It’s 2-0, half-time, no more, no less," he told The Guardian. "It is a dangerous scoreline. How much work is left to do? The full work.
"Nothing has happened yet. It’s 2-0 at half-time and we have to be completely on alert and 100% in the right mood. We have to play the second half like the first half, as though there is nothing to defend.
"We know we go there and it will be a tricky atmosphere for us. It will be different to tonight. These players, this coach, they will fight for it with all they have. And what I like is that we also fight with it with all we have."
Topics: Liverpool, Jurgen Klopp, Jordan Henderson, Villarreal, Champions League