Manchester United have beefed up security ahead of tonight's Premier League clash with Leicester after a heavy police presence was seen outside of Old Trafford ahead of the 6pm kick-off.
It is the first game back at Old Trafford since angry United supporters broke into the ground to protest the owners, the Glazers, which led to the club's Premier League clash with Liverpool to be called off as a result.
Campaigners have warned that more demonstrations could be planned, and United are taking no chances after a number of ugly incidents last week which violent clashes with police officers and unrest outside the Lowry Hotel where the players were staying.
And in an attempt to prevent a repeat of the violent demonstrations 10 days ago, United have called on extra security to deter protesters from gathering again tonight.
A 10ft high red wall has also been erected at the south-east corner of the stadium - where protesters twice broke in and got onto the pitch - as well the north forecourt in front of the Sir Alex Ferguson Stand. Additional steel barriers have also been put in place as part of the heightened security operation.
Having prepared for a peaceful protest last time out which then descended into violence, the club are now trying to ensure that their three remaining home games of the season go ahead safely.
Just hours before kicking off against Leicester, police were seen patrolling outside the ground while extra steel barriers were put in place to prevent disorder.
It comes as a result of furious fans expressing their rage against owners the Glazers who became incensed by the announcement of the European Super League last month, which included United as one of the founding members.
Hundreds of supporters forced their way inside the historic stadium and made their way onto the turf and across the stands in a show of rebellion against the way they feel the club is being run.
Greater Manchester Police, who had the final say on the postponement of the game, later confirmed that two officers had been injured in the surrounding protests, with one being 'attacked with a bottle and sustaining a significant slash wound to his face, requiring emergency hospital treatment.'
The mob of intruders at the stadium are thought to have gained access to Old Trafford through the Munich Tunnel, pushing down barriers despite security guards' attempts to stop them.
Some of the crowd kicked footballs that had been set up for the game while wearing green and gold scarves, which have become emblematic of the anti-Glazer movement as the colours of Newton Heath – the predecessor club to United.
There were clashes as the angry protestors tried to break police lines outside the stadium, with officers drawing batons to keep the crowds back and bottles and other projectiles thrown.
Ole Gunnar Solskjaer called for calm following the ugly scenes at the start of the month, asking fans to keep the peace if they are to protest and make their voices heard once again.
The United boss said: 'Security measures are being looked at, of course, and I hope that we can keep the protests – if there are protests – down to loud voices, nothing violent.
'We want to listen. The players want to play the game. We play Liverpool. Of course we want to beat Liverpool, we want to beat Leicester.
'So, we're going to do everything we can for our fans to celebrate what we're doing on the pitch.'
United were one of six Premier League clubs enlisted in the doomed Super League project last month, withdrawing 48 hours later following a furious backlash from the public, including club legends such as Gary Neville.
Joel Glazer subsequently apologised, but the many placards visibly criticising him during the day of turmoil were a clear display that those words fell on deaf ears.
United are also due to face Fulham in their final Premier League home game of the season on May 18.