Manchester City will submit a report to Liverpool on Monday detailing allegations that a member of Pep Guardiola's coaching staff was spat at by a supporter during Sunday's 2-2 draw at Anfield, sources have told ESPN.
Sources have said that City have video footage of a man suspected of spitting at a member of their backroom staff, although it is understood that it does not capture the spitting incident.
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The incident is alleged to have taken place as the City staff celebrated Phil Foden's second-half equaliser against Jurgen Klopp's team.
Liverpool confirmed they were looking into the alleged incident, releasing a statement: "Following a complaint of a serious alleged incident near the dugout area at Anfield during the second half of Sunday's game against Manchester City, 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.
"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."
Sources have told ESPN that both clubs have maintained a dialogue over the allegations, but having reported the incident to Liverpool officials, City have not lodged a complaint to the Premier League.
City manager Guardiola spoke about the incident after the game, urging Liverpool to take action.
"In every club there are people like this," Guardiola said. "Some can't control their emotions. I am pretty sure Liverpool FC will take measures against this person. I know that Liverpool is greater than this behaviour."
City's visits to Anfield have previously been impacted by crowd disorder, with the team bus attacked by fans en route to the stadium prior to a Champions League quarterfinal in April 2018.
On that occasion, windows on the bus were smashed by objects such as beer bottles and stones, forcing the City players and staff to lie on the floor and between seats to avoid injury.