Celtic will travel to Ibrox on Sunday for a League Cup quarter-final against Rangers without any of their own supporters in attendance, after the SPFL confirmed there would be no away fans permitted for the Old Firm clash.
According to Sky Sports, Celtic boss Martin O'Neill has revealed that police issued the club a message regarding "general behaviour" in the build-up to the fixture, underlining the sensitivity surrounding one of football's fiercest rivalries.
On the playing side, O'Neill has a boost with Mika Baur available for selection despite the defender missing training this week. His inclusion will be welcomed by a Celtic side that has enjoyed a flawless start to the domestic campaign, winning all six of their Premiership matches so far this season.
The quarter-final tie represents a significant early test of that form, with both clubs eager to progress in the competition. As ever, an Old Firm derby carries added weight regardless of the stakes, and Sunday's clash promises to be no different — even with the atmosphere altered by the away-fan ban and heightened security concerns around the occasion.