Liverpool have stated they have substantial evidence relating to Manchester City's claim that a supporter spat at a member of their staff.
City made an official complaint to Liverpool about the incident, which they say occurred after their first equaliser in the 2-2 draw at Anfield.
The Reds have now released a statement saying they are conducting an investigation and have already analysed footage and contacted witnesses.
"We are conducting a full investigation, working with all relevant parties including Manchester City, to gather evidence from individuals who witnessed the incident as well as analysing all available video footage," a statement on Monday said.
"The evidence collected to date is substantial and, if requested to do so, will be handed to Merseyside Police given the potential for criminal charges. This case will also be subject to the club's official sanctions process.
"Anfield is our home and we will ensure it is a safe, enjoyable environment for everyone attending and will not allow unacceptable isolated behaviour to impact on our club's values and principles."
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