Manchester City have "strongly condemned" the actions of those responsible for damage to the Liverpool team coach on its journey back from the Etihad Stadium on Saturday.
The club said an object was thrown towards the coach in a residential area after City's 4-1 Premier League win.
City and Liverpool will support Greater Manchester Police's investigation.
"Incidents of this kind are totally unacceptable," the Premier League champions said in a statement.
"We strongly condemn the actions of the individual(s) responsible."
The club also said they were "disappointed" by "inappropriate chants" by their fans during the game.