Liverpool captain Jordan Henderson looked like he was ready to kill Joel Matip after he slapped him on the head during the Reds' goal celebrations.
Jurgen Klopp's side won 2-0 away at the San Siro in the Champions League round of 16 first leg against Inter Milan, with Roberto Firmino and Mo Salah scoring in quick succession late in the second half.
Firmino, who entered the fray at half-time broke the deadlock in the entertaining clash with a header from Harvey Elliott's corner in the 75th minute.
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The Liverpool players all rushed to celebrate and embraced in a huddle. Substitute Matip was warming up nearby and used the opportunity to playfully smack Henderson.
Henderson had his back to the Cameroonian, who produced a few slaps to his teammates' heads.
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But the England international's facial expression was an absolute picture. While Matip was stood there laughing, Henderson did not see the funny side and cracked a death stare before appearing to let out an expletive.
Matip's antics garnered a lot of reaction on social media, with Reds legend Jamie Carragher admitting his slap was his "highlight of the night" and tagging the hilarious No Context Joel Matip Twitter account.
We haven't seen a look like that from Henderson since he stared deep into the soul of Diego Costa during a meeting between Chelsea and Liverpool in 2015.
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The pair had a feisty battle in the Carabao Cup semi-final first leg and there was one moment where Costa squared up to the former Sunderland midfielder.
But Henderson backed himself and did not flinch, glaring at the striker.
Topics: Jordan Henderson, Liverpool, Joel Matip