Celtic manager Neil Lennon has pleaded with fans not to repeat the scenes that unfolded after the Betfred Cup defeat to Ross County.
A 2-0 home defeat saw fans turn out outside the stadium to call for the manager to go, with players targeted with missiles as they left Celtic Park.
The board pledged to identify the troublemakers, while Lennon warned supporters that their actions would not help his team turn their form around.
Thursday's 4-2 loss to Milan in the Europa League extended Celtic 's miserable run to just two wins in 11 games.
They face St Johnstone at Parkhead on Sunday and with Rangers playing in the early kick-off a failure to win could prove disastrous for their title hopes.
And while Lennon understands the frustration of fans he has urged them not to repeat the protests that followed Ross County.
He said: "Well, hopefully they will be celebrating a victory because that is what we will be trying to do. As we always do.
"I touched on what I thought of it on Sunday and if it is going to be reminiscent of Sunday, it is not what we need or what the players need at the minute."
A busy December sees Celtic play home league games against St Johnstone, Kilmarnock, Ross County and Dundee United, as well as a trip to Hamilton, and there is also the final Europa League group game against French side Lille and the William Hill Scottish Cup final against Hearts at Hampden Park.
Lennon believes that regardless of venue Celtic need to find a winning formula quickly and he took encouragement from their performance in Italy.
The former Celtic captain, in his second spell as manager of the Parkhead club, said: "Home or away, it doesn't matter.
"We have to put in performances that reach the levels we reached last night.
"I saw plenty of signs last night that we are more than capable of that which please me."
