Celtic have been served with a notice of complaint by the Scottish FA, accused of breaching four of the governing body's rules.
The Parkhead club are accused of failing to stop their supporters displaying an offensive banner during their friendly match with Norwich City in July.
The banner in question depicts a gunman shooting a Rangers supporting zombie which has risen from the ground next to a gravestone carrying the club's badge.
To the left, a reverse evolution process is shown, going in four stages from man to an ape which is sporting a Rangers scarf.
Celtic have until next Thursday to respond to the accusation, with a hearing scheduled for Thursday, October 11.
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