Celtic face a Scottish Football Association charge after their fans waved an offensive banner celebrating the decline of arch rivals Rangers during a pre-season friendly against Norwich.
The SFA today issued a notice of complaint alleging four rule breaches over the banner, which was brandished by Celtic supporters at Parkhead in July.
Celtic are accused of failing to prevent fans from bringing the banner into the ground and then displaying it.
The Scottish champions are also accused of failing to deal effectively with an instance of unacceptable conduct, "by allowing spectators to retain possession of the banner after it had been initially displayed, which allowed them to display the banner on a second occasion during the above match".
The banner in question is understood to have featured a gunman shooting a figure next to a gravestone with the Rangers badge on it, as supporters mocked the impending liquidation of the Ibrox club.
The banner featured a silhouetted gunman emblazoned with a green shamrock taking aim at a zombie-like figure in front of the tombstone.
Celtic have been given until next Thursday to respond to the notice of complaint with a hearing date set for October 11.