The green, white, and black messaging reads: “Jan review: Parasites, Liars, Charlatans” with the first letter of every word highlighted in a plc reference.
The banner was left outside Celtic Park on Wednesday morning and is the latest demonstration by the group, which has been voicing its displeasure over several aspects of how the club is run.
Last week the same collective unfurled a banner at the club’s Lennoxtown training complex urging the club to remove under-fire manager Neil Lennon from his position.
The banner simply read: “Lennon Out” and was accompanied by a message from the group insisting that the former Hoops midfielder should be "removed from his post immediately".
The statement read: “In October, Neil Lennon stated that should things deteriorate he would hold his hands up and walk away.
"In December, the Celtic board announced that it would review the progress of the management team in the new year.
"Despite no progress, neither party has been true to their word. Not making a managerial change last year cost the club any chance of the league title.
"Continuing to stick with Neil Lennon now only delays the substantial rebuild required throughout the club and further jeopardises his diminishing Celtic legacy.”
Celtic are currently on 55 points; 21 points behind Rangers with two games in hand. They are just six points ahead of a revitalised Hibs in third place, who have also played two games more than the Hoops.