Martin O'Neill disclosed that Police Scotland issued a broad "general behaviour" advisory to Celtic in preparation for the upcoming League Cup quarter‑final against Rangers at Ibrox on Sunday. The authorities have decided that no Celtic supporters will be permitted inside the 50,000‑seat arena, a decision that stems from an ongoing dispute over ticket allocations between the two Glasgow powerhouses. The disagreement over tickets is partly a fallout from the previous Old Firm encounter in Govan in March, a match that descended into chaos as fans became disorderly after Celtic secured a dramatic win on penalties following a goalless 120 minutes in the Scottish Gas Scottish Cup quarter‑final.

In the aftermath of that unrest, both clubs were ordered to stage their next home Scottish Cup fixtures behind closed doors and were each slapped with a £100,000 compensation charge, payable to the team drawn as the away side in their respective next cup matches. At 74 years old, the Celtic manager admitted that playing without his own supporters would feel "a bit strange," yet he expressed a mixture of nervousness and excitement about the unique atmosphere, calling the fixture "a great game." He also commented on the brief police visit that took place earlier in the day. "We had the police come in today, just a short 15‑minute meeting with us, just reminders of our behaviour, which I think is actually a timely reminder.

It's a good thing as well," O'Neill said. He went on to explain that the police message was intended to cover the overall picture of conduct, both on and off the pitch. "Gosh, it'd be nice to have something to celebrate. I think it's just general behaviour from us," he added, indicating that the authorities were primarily concerned with preventing any escalation of violence or overly exuberant celebrations that could reignite tensions.

O'Neill speculated that the police likely considered what might happen during the match itself, noting that "you don't want any sort of punch‑ups for a start; secondly, you don't want too excessive celebrations, stuff like that, if that was the case." He made it clear that while he would welcome a victory and the chance to celebrate, the recent history of disorder meant that the club needed to be especially mindful of its conduct. Beyond the security concerns, O'Neill also addressed team selection ahead of the Ibrox clash. He confirmed that midfielder Mika Baur would be back in training on Saturday after missing Friday's session due to a minor knock. However, the manager has yet to decide whether newly signed goalkeeper Sam Johnstone will retain his starting spot or be replaced by Viljami Sinisalo, who began the season as Celtic's first‑choice keeper.

Johnstone, an experienced England international currently on loan from Wolves, made his Celtic debut in a 1‑0 Scottish Premiership victory over St Johnstone at McDiarmid Park. When asked about his role, O'Neill said, "I haven't made my mind up at all. It was a matter of getting a look at what Sam can do.

It's great to have the two of them. Big Viljami has done exceptionally well for us and it was just, again, an opportunity to see what Sam can do now. What he could do a couple of years ago was fantastic; what he can do now might be a totally different picture.

I will let them know first." The broader context of the Old Firm rivalry adds another layer of intensity. The two clubs have a long‑standing history of passionate, sometimes volatile, encounters that extend beyond the pitch. Recent incidents have prompted both the Scottish Football Association and local law enforcement to adopt stricter measures, aiming to protect fans, players, and officials while preserving the competitive spirit of the derby.

In addition to the police warning, the clubs face financial repercussions. The £100,000 compensation levy, which will be awarded to the away side in each club's next Scottish Cup fixture, serves as both a punitive and deterrent measure, emphasizing the seriousness with which the authorities view fan misconduct. Looking ahead, the upcoming match at Ibrox promises to be a test of discipline as much as skill. Celtic will need to adapt to playing in a hostile environment without the vocal support of their own fans, while also ensuring that any celebrations remain measured.

For Rangers, the opportunity to host their arch‑rivals in an empty stadium could provide a tactical advantage, but they too must avoid any lapses in conduct that could attract further sanctions. The situation also highlights the evolving nature of football security in Scotland. Police Scotland's proactive approach—issuing general behaviour advisories and enforcing stadium bans—reflects a broader trend across European football to pre‑emptively address potential flashpoints. By engaging directly with club management, officials hope to foster a culture of responsibility among players, staff, and supporters alike.

As the match draws near, fans on both sides will be watching closely to see how the clubs navigate these constraints. The absence of Celtic supporters will undoubtedly alter the atmosphere, but it may also shift the focus onto the players' performances and the tactical battle between Martin O'Neill and his Rangers counterpart.

Whether the police warning translates into a smoother, more orderly game remains to be seen, but the stakes—both sporting and disciplinary—are undeniably high. In summary, Celtic have been handed a general conduct warning by Police Scotland ahead of a high‑profile League Cup quarter‑final at Ibrox, with the added complication of a ticket allocation dispute that has resulted in a fan‑free stadium. The club faces both logistical challenges and financial penalties, while also juggling squad decisions, particularly in goal. The outcome of the match will not only impact the cup run but also set a precedent for how future Old Firm clashes are managed in terms of security and fan behaviour.