Celtic PR issued a season ticket renewal reminder last week. It featured footage of Celtic boss Ange Postecoglou's stirring team talk ahead of the League Cup final against Hibs at Hampden Park in December.

The accompanying video contained a line that was "Taylor-made" for this contest. While I am not sure if the Aussie is a cut and paste merchant, his message and its simplicity hit home and then some today at Ibrox.

"Don’t let any chaos out there derail from what we’re all about," he said. "That’s the most important thing."

One down in the Glasgow derby after three minutes. Celtic's backline at that moment in time resembled the chaos theory.

Step forward Tom Rogic. Step forward, Cameron Carter-Vickers and Carl Starfelt.

Postecoglou's compatriot was imperious as he gave a midfield masterclass as Celtic reached out and placed one hand on the Scottish Premiership trophy with a 2-1 win over Rangers at Ibrox courtesy of goals from Rogic and Carter-Vickers

The central defence pairing was immense and repelled everything Rangers could throw at them.

Six points ahead in the title race with six games to play. It is definitely Celtic's championship to lose now.

They were in a healthy place and in fine fettle ahead of this crucial Glasgow derby as they put their 31 unbeaten domestic run on the line at Ibrox. All eyes were on Celtic boss Ange Postecoglou ahead of the visit to Govan.

The 700 strong but small band of Celtic supporters who crammed into the tiny corner of Ibrox were put out of their misery 75 minutes before the kick-off and they found out that Socceroos midfielder Tom Rogic has won his fitness battle.

The Australian took his place in a starting lineup that featured nine of the Celtic team that had dismantled Rangers 3-0 back in February with only Daizen Maeda making his debut for the visitors in the fixture.

Perhaps the only surprise was the fact that Kyogo Furuhashi, who had been declared fit in midweek, was not handed a place on the bench.

READ MORE: Detailed Celtic player ratings as Daizen Maeda and Cameron Carter-Vickers impress in Ibrox cauldron

Three minutes in and it was Celtic who were doing the chasing as Josip Juranovic was caught hopelessly out of position and Ryan Kent squared for Welshman Aaron Ramsey to fire home from eight yards.

It was a dreadfully poor start for the visitors but Rangers' joy lasted all of four minutes as Celtic were on terms.

Captain fantastic Callum McGregor strolled forward with real purpose and caused consternation in the Light Blues rearguard. Rogic's initial effort was charged down and the ball broke to Reo Hatate's shot whose shot was blocked by Allan McGregor and Rogic justified his inclusion by pouncing on the rebound to steer a half-volley into the net to make it 1-1.

Rogic was proving to be a class apart and it was he who blasted over the top from a good position in the 25th minute as Celtic started to attack with increasing menace at every opportunity.

It was Postecoglou's men who squeezed their noses in front two minutes before the interval when Starfelt knocked the ball down into the path of Carter-Vickers following Jota's long corner to the back post and the on-loan Spurs defender reacted swiftly to ram the loose ball home via a deflection.

The Australian celebrated and fist-pumped with gusto in the technical area.

The second half was scrappy as it developed into a real war of attrition - but that suited Celtic. It was Carter-Vickers and Starfelt who stood firm at the heart of the Celtic defence, on what many predicted would be a defining day of the Scottish Premiership season.

It was the ultimate day of 'if' for both sides. It was Celtic who kept their heads when all about them were losing theirs. It was Celtic who dared to dream and not allowed dreams to become their master. It was Celtic who met with triumph and disaster and treated the two impostors just the same.

It is Celtic boss Postecoglou who has talked with crowds and kept his virtue. The Aussie has walked with Kings and not once lost the common touch all season. With 90 minutes of distance run, Celtic's is now the earth and everything in it... and which is more, you'll be a man my son.

That's the very same quality that Celtic captain Callum McGregor demanded of his team-mates on Friday.

"That's what we need to do we need to go to Ibrox and be men and stand up and be counted," he said. "We will be giving everything we can to make sure it is a positive result."

Celtic stood up to be counted all right.