Manchester United have denied reports club staff let fans into Old Trafford during Sunday’s protest, while the club are working with police “to identify those involved in criminal activity”.
United’s game against Liverpool was postponed after demonstrations outside the team’s hotel and then inside the stadium.
The club say supporters gained access to the Old Trafford pitch through “criminal damage” rather than help from Man United staff, the club say.
Fans are not currently permitted to enter Old Trafford due to the coronavirus pandemic, but a number of individuals gained access to the ground and then the pitch.
The Glazers were credited with key roles in the attempts to launch an unpopular European Super League last month.
Neither United nor the Premier League have yet confirmed a new date for the Liverpool match.