Manchester United say the club will take action against supporters found to have engaged in criminal activity in yesterday's protests.
Their Premier League game with Liverpool was postponed after fans invaded Old Trafford and staged protests outside the stadium.
The club also says that reports suggesting club staff helped protestors gain access to Old Trafford are wide of the mark.
"While many fans wanted to exercise their right to protest and express their opinion peacefully," the statement reads, "some were intent on disrupting the team’s preparation and the game itself, as evidenced by activity at the Lowry Hotel and at the stadium."
"Reports in mainstream and social media that protesters were able to access the stadium and pitch via a gate opened by club staff are completely incorrect.
"After breaking through barriers and security on the forecourt, some protestors climbed the gates at the end of the Munich tunnel, then forced access to a side door in the stand, before opening an external door that let others through to the concourse area and the pitch.
"A second breach occurred when a protestor smashed the door of a disability access lift, enabling a group to enter the stand.
"The majority of our fans have and will condemn criminal damage, along with any violence towards club staff, police or other fans, and these now become a police matter.
"The club has no desire to see peaceful protestors punished, but will work with the police to identify those involved in criminal activity, and will also issue its own sanctions to any season ticket holder or member identified, per the published sanctions policy.
"Information on the rescheduling of the game and any possible implication on other fixtures will be announced after discussion and agreement with the Premier League.
"We remain committed to dialogue and engagement with our fans through the Fans Forum and other appropriate channels."
A date for the rearranged fixture against Liverpool has yet to be confirmed.