Union Saint-Gilloise’s opening goal against Liverpool in Thursday’s Europa League match was scorned as offside by Liverpool fans.

Jurgen Klopp’s team fell behind in their final group stage match in the second-tier European competition when Mohamed Amoura scored.

Liverpool fans feel replays revealed the striker was offside when the Belgians seized the lead against the flow of play.

Amoura went through on goal and finished past second-choice goalkeeper Caoimhin Kelleher, appearing to be offside as he ran through Jarell Amorin Quansah and Ibrahima Konate.

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Gustaf Nilsson passed the 23-year-old through on goal, but photos show him ahead of Liverpool defenders Quansah and Konate.

One Liverpool fan shouted, ‘Offside surely?’ before adding, ‘come on, it’s just a small fraction of a second. Zoom in to observe the ball’s white color near his foot.

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‘Blatant cheating he’s so far offside,’ said another after the disputed goal stood.

Union Saint-Gilloise scored first, but Liverpool defender Quansah equalized minutes later with his first club goal. VAR didn’t review the incident.

Cameron Puertas’ third goal of the half gave the home side the lead again at halftime.

Another frustrated Reds fan added: ‘Sorry to hammer the issue but a better screenshot doesn’t make it any more onside, does it? Ha.’

Another internet comment read: ‘Clear as day offside. Regardless of the event, we get no replays for a reason.

After winning their group, Klopp’s team has qualified for the next stage of the competition, so the outcome doesn’t matter.

He rested numerous first-team starters before Sunday’s hotly anticipated Premier League match against Man United at Anfield.