Fans took to social media to express their anger Tyler Morton was not sent off for a reckless challenge on Ricardo Pereira in Liverpool's win against Leicester.
The Reds sealed their progression to the Carabao Cup semi-finals - where they will play Arsenal - after a penalty shootout victory against the Foxes at Anfield on Wednesday.
Jurgen Klopp's men came from 3-1 down to take the game to spot kicks, with Alex Oxlade-Chamberlain, Diogo Jota and Takumi Minamino all on target.
But they may have found it tougher had they been reduced to 10 men when 19-year-old midfielder Morton left the ground and clattered into full-back Pereira, who latter hobbled off the pitch.