Manchester United have been placed on red alert amid growing concerns of another huge fan protest ahead of next week's visit of arch rivals Liverpool.
Club bosses fear a repeat of the shocking scenes at Old Trafford last season that saw supporters break into the stadium and force the high-profile fixture to be called off.
Those fears were increasing last night, when United fans took to social media to encourage what some described as "Round Two" of a protest that left English football stunned.
United chiefs are consulting with local authorities, including Greater Manchester Police, in a bid to make sure necessary security is in place to guarantee the games goes ahead without significant disruption.
Tensions are running high among fans again in the wake of United's poor start to the season.
United slumped to a dismal 4-2 defeat at Leicester on Saturday and the pressure is mounting on Ole Gunnar Solskjaer, following just one win in his last five games in all competitions.
A growing number of supporters want Solskjaer sacked, while the controversial ownership of American billionaires the Glazers continues to cast a dark cloud over Old Trafford.
United are aware there is increased potential for serious trouble this weekend ahead of the visit of Jurgen Klopp's bitter rivals, but remain determined to do whatever it takes to stop the same thing happening again.
The biggest game in English football was postponed in May when hundreds of United supporters invaded the stadium and broke into the dressing rooms as well as going on the pitch.
Dozens clashed with police, leading to several arrests, while others demonstrated outside the team's Lowry Hotel, preventing Solskjaer's stars from leaving for Old Trafford to take part in the game.
Covid rules were breached, leaving match officials with no choice but to abandon the match amid fears for player security after stewards found themselves overpowered.
The Premier League launched an investigation, but decided not to punish United.