The 25-year-old collided with City’s Ederson on the edge of the box with his high boot facing the goalkeeper’s face.
And referee Jon Moss did not hesitate to dismiss the Premier League Player of the Month for August as the goalkeeper was stretchered off.
Afterwards, fans took to Twitter to share their opinions as Mane’s sending off compounded the woes of Jurgen Klopp’s men after Aguero's opening goal opened scoring for Gabriel Jesus and Leroy Sane who bagged a brace each.
Imo, he had every right to go for the ball - never stops looking at it. Red card for that challenge looks kind of ridiculous to me... https://t.co/5XfqvKIQ6Q— Ed Dove (@EddyDove) September 9, 2017
Sadio Mane surely unlucky to be red-carded. Legitimate attempt to get the ball, though Ederson de Moraes stretchered off. MC 1-0 LIV— Jim White (@JimWhite) September 9, 2017
Never a red card. He has to challenge for the ball, Mané eyes are fixed on the ball. Ederson dips his head in— Chris Williams (@Chris78Williams) September 9, 2017
That's a joke decision. Mane only ever looking at the ball.— James Pearce (@JamesPearceEcho) September 9, 2017
Not malicious from Mane. But that foot was recklessly high. No question about the punishment or colour of the card #NPFLFinalDay17— Colin NOT Collins (@ColinUdoh) September 9, 2017
It can't even be up for debate. That was a red. Mane's foot was recklessly high & dangerous. Cannot be permitted in football. Ref was right.— Babanla (@biolakazeem) September 9, 2017
Mané sent off. Referee got it right for me.— Bolarinwa Olajide (@iambolar) September 9, 2017
My #FPL team is messed up in 37 minutes. Chai! On a wildcard weekend.
I need a hug. 😢