The upcoming Old Firm clash on Sunday promises to be a decisive moment for both clubs as they vie for supremacy in the Scottish Premiership. With Rangers having recently stamped their authority with a convincing League Cup victory, the question now is whether Celtic can stem the tide of pressure or if Rangers will further narrow the points gap. The match will be broadcast live on Sky Sports, and it comes just seven days after Ibrox sent a clear message by winning the League Cup in emphatic fashion.

That triumph has injected confidence into Derek McInnes's Rangers side, while Martin O'Neill’s Celtic are still reeling from a string of setbacks that have shaken their dominance. Celtic’s recent form has been a roller‑coaster. Only a few months ago, O'Neill was hailed as a hero for steering the club to a league‑and‑cup double, rescuing a season that had seemed to be slipping away. The subsequent exit from the Champions League at the hands of LASK was a disappointment, yet a strong start in domestic competition had kept the pressure at bay.

However, the recent 3‑0 defeat to Rangers in the League Cup final, followed by a 3‑1 loss to Ferencváros in the Europa League, has turned Sunday into a must‑win fixture for the 74‑year‑old manager, even if he publicly downplays the urgency. Celtic will enter the international break still perched at the top of the league table, but a pair of defeats to their fiercest rivals is a bitter pill for a fanbase accustomed to prolonged periods of dominance. O'Neill has admitted that the squad's confidence has taken a hit, and he will be looking for ways to restore belief ahead of the showdown.

At Ibrox, the atmosphere appears to be easing for McInnes after a turbulent start to his tenure. Early doubts about his ability to secure European qualification and deliver trophies were amplified by a sluggish domestic opening.

Yet a tactical masterclass against Celtic in the League Cup semi‑final, which saw Rangers press high and dominate the midfield, has shifted momentum in his favour. A win on Sunday would place Rangers just two points behind Celtic in the league, while a loss would widen the gap to eight points after only seven matches, reigniting scrutiny of McInnes's methods.

O'Neill faces a complex selection dilemma ahead of the match, with five key positions under scrutiny. Based on recent line‑ups, a probable starting eleven can be projected: captain Callum McGregor, creative midfielder Benjamin Nygren, prolific striker Camilo Duran, fan‑favorite left‑back Kieran Tierney, dependable centre‑back Cameron Carter‑Vickers and academy product Colby Donovan. In goal, Sam Johnstone’s shaky debut was replaced by former No.1 Viljami Sinisalo for the Europa League tie, leaving the goalkeeper spot open for debate. At left centre‑back, Liam Scales and Auston Trusty have been rotating, though Scales has started the last two games in that role.

In midfield, McGregor was left exposed as a lone holding midfielder in the previous encounter, prompting speculation that O'Neill might introduce Alex Oxlade‑Chamberlain to partner Mika Baur, thereby offering additional protection. The tactical shape could shift from a single defensive midfielder flanked by two attacking mids to a double‑pivot with a more advanced number ten. On the right wing, Haissem Hassan, who arrived from Real Oviedo this summer, impressed but was omitted from the last starting XI. Given Rangers' tendency to defend with three at the back, Hassan could be a valuable asset.

Up front, club‑record signing Kasper Høgh has struggled to find the net, featuring in only one of his seven appearances. He was benched against Ferencváros to allow Duran to operate as a natural number nine, making it likely that the Colombian will retain his place. This leaves James Forrest and Sebastian Tounekti competing for the left‑wing slot.

McInnes’s game plan at Ibrox was a study in tactical flexibility. He deployed left‑back James Penrice as an auxiliary midfielder, effectively crowding the centre of the park and enabling Rangers to press Celtic man‑for‑man. Wing‑backs Djeidi Gassama and Min‑Su Kim provided width and energy, while the back three of Dujon Sterling, Emmanuel Fernandez and Olwethu Makhanya held a compact defensive shape against Celtic’s attacking trio.

This bold approach paid dividends, as Celtic appeared to fold under sustained pressure. Midfield dominance was epitomised by Dan Neil, who outshone his Celtic counterpart McGregor, who was left isolated without a defensive partner.

Neil’s performance, capped by two memorable derby goals, would likely have earned him player of the match regardless of the scoreline. Celtic Park presents a different challenge, especially with the restriction on away supporters due to a ticket allocation dispute between the two Glasgow clubs. McInnes may adjust his formation, perhaps adding an extra body in midfield.

If he does, the choice could fall between Ryan Naderi and Kevin Kelsy for the central striker role. Kelsy, fresh off his first Rangers goal, has been a constant threat, while Naderi, who supplied the assist, is doubtful with an ankle issue.

Bojan Miovski, a former Aberdeen player familiar with the intensity of Celtic Park, also remains an option. Should McInnes get the tactics right, he would join the elite company of Walter Smith, becoming the first manager since 1991 to win his first two Old Firm meetings in charge.

The stakes are high for both sides, and the outcome will shape the narrative of the season. Celtic manager Martin O'Neill summed up his perspective in a post‑match interview: "We're far from rock bottom.

We're still in the lead and if we could win this, we can extend the lead and if we don't, even by the international break, we're still going to be in front. We need to be up for the game.

It would be nice to win it; it wouldn't be great if we lost. That would be three on the trot and a psychological blow, but we have to be ready." Rangers boss Derek McInnes offered a pragmatic view on tactics and performance: "Just because you win the game doesn't mean you always have the tactics right, and when you lose it doesn't mean they're wrong. Individual moments and player performance matter more. The aggression, confidence and energy we displayed last week are more important than any tactical blueprint.

We need the players to go into the game with that message loud and clear – a big performance is required. You don't win at Celtic Park unless everybody plays well. Once the ball rolls, it's a game of football, focusing on detail in and out of possession." Both managers recognise the fine margins that separate victory from defeat in this storied rivalry.

With the league title hanging in the balance, European ambitions, and pride at stake, Sunday’s encounter is set to be a captivating chapter in the Old Firm saga, offering fans a blend of tactical intrigue, individual brilliance, and the ever‑present drama that defines Scottish football.