The Police were called to Manchester United's Carrington training ground on Friday after some fans stormed the area in protest against the players and the club owners.
Some fans held up the infamous "Glazers Out" banner to demand the Glazer family sell up, others also held a banner boldly bearing "not fit to wear the shirt. 1958".
The latter is a warning to the current crop of players at the club which is struggling to win a match, talkless of making the top four, owing to a run of poor form.
1958, per UK Sun, is a reference to the legendary Busby Babes squad of 1958, eight of whom died in the Munich Air Disaster.
While some held up the banners, others fans also let off red flares outside the training centre.
The publication reported that the cops were called in but the protest was said to be "peaceful" with around 30 people present.
Reacting, the club's statement read: "There was a small and peaceful protest outside the Carrington training ground today.
"We respect the opinions of fans and remain committed to strengthening our engagement with them."
Under interim manager, Ralf Ragnick, United appeared to have bottled their chances of a top-four finish having won only one of their last five Premier League matches.
Qualification for the Champions League looks bleak and United will require a slip from Tottenham, Arsenal and West Ham.
As it stands, United are currently six points off fourth-place Tottenham, but Arsenal, in fifth, have games in hand on both teams.
Meanwhile, the club has reached a verbal agreement with Ajax coach, Erik ten Hag, who is set to take over from Ragnick next season, pending an official announcement from the club.