A Benfica fan launched a stick-like object at Luis Diaz after he scored for Liverpool in their Champions League clash.
Diaz was shockingly under attack by a Benfica fan after bagging his side's third goal in their quarter-final first leg match on Tuesday.
Naby Keita brilliantly slid in the Colombian winger, who rounded the keeper before scoring into an empty net to make it 3-1 on the night.
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He wheeled away in celebration towards the Benfica fans, passionately celebrating his first Champions League strike for Liverpool.
But as he turned away from the home supporters, a fan hurled a stick in his direction - appearing to hit Keita, who joined in on the celebrations.
Andy Robertson spoke to BT Sport following the victory in Lisbon and hailed the performance of Diaz while touching on the disgraceful incident.
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"I got quite a few lighters thrown at me (taking corners), maybe it will stop them smoking! But you should try not to throw things on the pitch because it can hurt people. Luckily none hit me," he revealed.
Robertson added: "Luis' goal was really important for us - it was massive to give us that cushion. Hopefully we can get the job done next week.
"He [Diaz] got a nice reception from the start, playing for one of their rivals, but a good goal for him and a two-goal cushion makes a difference. Hopefully, we can get the job done."
Jurgen Klopp's side take a two goal lead into the return leg next Wednesday.
Nasir Jabbar