Manchester United will punish any fans found to have been involved in criminal or violent behaviour during protests which forced the postponement of their Premier League match at home to Liverpool.
A number of supporters forced their way into Old Trafford prior to Sunday's scheduled kick-off as a demonstration against club owners the Glazer family escalated into incidents of damage and violence.
Two police officers were injured, with one requiring emergency hospital treatment, while bottles and barriers were thrown outside the ground, according to Greater Manchester Police.
United are working with police to identify fans involved but, according to their sanctions policy, damaging property or disorderly behaviour warrants a one to six-game ban.
Their policy adds that abusive or aggressive behaviour towards staff, police or anyone else in a working capacity or any other criminal activity can lead to indefinite suspensions.
Police said a 28-year-old man has been arrested in connection with the protests.
"The club has no desire to see peaceful protesters 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," it said in a statement.
United have rejected claims staff opened gates to allow protesters inside Old Trafford and say entry was gained by illegal means.
"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," United said.
The Manchester United Supporters Trust (MUST) has written an open letter to Joel Glazer demanding the owners engage in supporter consultation to avoid a repeat of the scenes at Old Trafford and has put forward a four-point plan to advance this.
"None of us want this to continue. We all have better things to do. So we need to find a way forward," said the letter from MUST, who have given a Friday deadline for a response.
"We remain committed to dialogue and engagement with our fans through the Fans Forum and other appropriate channels," United said.
The postponement has given Premier League planners a headache as United are scheduled to play every midweek until the end of the season.
This means the most likely option is to stage the match on the weekend of the FA Cup final (May 15-16), with Liverpool's game against West Brom brought forward to accommodate that.
"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," United said.
The Football Association, which is also investigating incidents at Old Trafford, took a dim view of fans' behaviour.