Pictures prove Mane’s third goal in his last three games SHOULD have been disallowed.
James Milner was a yard beyond the last defender when he picked up a pass before his low cross was turned in by Mane from close range.
Milner was right in front of the assistant referee when Adam Lallana flicked through a deft pass with the outside of his right boot.
But the flag did not go up despite Milner being clearly offside and he was able to lift his head before picking out the Liverpool attacker.
BBC pundit Chris Sutton was stunned by the decision not to disallow the goal but praised mane for a good finish.
“It is such a big goal and Sadio Mane is the man,” he said.
“West Ham, who have been bright in the early exchanges, have been undone.
“James Milner looks offside but Mane is alert and he pokes it into the far side of the goal.
“But it was an astonishing decision and I don’t think it should have stood.
West Ham got their revenge shortly after when Michail Antonio sent a low drive past Alisson and into the far corner.
A clever free-kick routine saw Antonio play a one-two with Felipe Anderson and he left Alisson rooted to the spot as he scored after nine games without a goal in all competitions.
The winger has been struggling for goals lately but he has five in his last five Premier League games against Liverpool.
Antonio might have dealt a hammer blow to Jurgen Klopp’s Reds title chances as they look to restore their five-point lead at the top of the table.
But the Hammers will be kicking themselves that they didn’t get a winner.
Mark Noble and Declan Rice both spurned chances, firing over the bar when the goal was gaping.
And West Ham restricted Liverpool to pop-shots from outside the box for the rest of the game.