The ball looked agonisingly close to crossing the line and could have been within that margin.
In the end referee Anthony Taylor ruled that it was no goal though.
And it was later confirmed the system measured the ball to be 11mm away from crossing the line.
And Liverpool ended up falling behind before half-time thanks to a left-footed effort from Sergio Aguero powered past Alisson.
Liverpool were denied a goal at Manchester City (Image: SKY SPORTS)
John Stones cleared the ball off the line for Man City against Liverpool (Image: SKY SPORTS)
To the naked eye it looked like Liverpool had scored at Man City (Image: SKY SPORTS)
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Reds fans were quick to blame goal-line technology as well on social media.
One said: “To me it’s goal . City turned off goal line technology.”
Another added: “Petition to change goal line technology operating system.”
And a third said: “Goal line technology is just a scam #lfc.”
Sergio Aguero opened the scoring for Man City (Image: GETTY)