I'M GOING to make him an offer he can't refuse. It's a famous cinematic line from the first of The Godfather trilogy.

If you are a member of the Celtic board today then you could do worse than seek out Don Postecoglou - I mean, Ange Postecoglou - for a contractual chat.

They should have already called an emergency meeting and be sat around the negotiating table right now with the club's prized asset. In fact, if they have got any smarts about them they should be nailing the Aussie down to something more fluent than a one-year rolling contract.

In essence, The Godfather films are all about power and building empires. Coming to think of it, Postecoglou is attempting to do something similar in Glasgow's east end. He's trying to make Celtic the dominant power in the city and force in the country once again after a 12-month hiatus. The 56-year-old is aiming to create his own dynasty both at home and abroad.

Ironically, it was first blood to Celtic in the April trilogy between the two Glasgow giants at Ibrox on Sunday. The 2-1 victory in Govan saw the title pendulum swing back massively in favour of Posetecoglou's side.

Six points ahead in the Scottish Premiership title race with six games left to play in the season. It is, to all intents and purposes, Celtic's championship to lose now.

The narrative has changed utterly since Ibrox. Celtic went there in the most hostile of atmospheres and got off to the worst possible start in a game that was being dubbed a league decider.

Momentum was with Rangers after just three minutes as Giovanni van Bronckhorst's men set about the visitors and took the lead courtesy of an Aaron Ramsey strike.

Yet somehow Celtic lifted themselves off the canvas within four minutes as Callum McGregor and Tom Rogic combined to help draw them level. Camero Carter-Vickers then plunged a dagger into Rangers' hearts and punctured their title aspirations when he netted what proved to be the winner in the 43rd minute.

Hard as it might be for Rangers and their supporters to stomach, Postecoglou has built a team full of resilience, character and steel. A team that can cope with adversity and setbacks along the way.

Make no mistake, a lesser Celtic team could have folded at Ibrox due to Rangers' whirlwind start. But not this brand of Celtic - not on Postecoglou's watch.

"They have displayed character from day one," Postecoglou said. "That is what I keep saying. The one thing that people may have overlooked is that there is real steel to this team and there is resilience. We lost three games in our first six and we were still putting a team together as the league had already started but there were no excuses as we wanted to keep pushing on.

"We had to show that today as Rangers were at it and they put us under pressure and the crowd was behind them. I am super proud of their efforts."

READ MORE: Why Celtic's Ibrox victory was a moment of consecration for Ange Postecoglou - Kevin McKenna

Celtic overcome adversity - or "chaos", as Postecoglou likes to call it. If Ibrox was a test of Celtic's title mettle and credentials the Aussies' men passed it with flying colours and with bits to spare.

Perhaps more telling was the body language of some of the Rangers players who slumped to the deck after the crushing loss which suggested that they were out on their feet in more ways than one.

Conversely, the Celtic players were out on their feet too in Govan because they had strained every sinew for the cause.

Postecoglou has instilled a belief and sense of purpose in this team. They are relentless and ruthless in their place of work with Postecoglou leading from the front.

Ibrox on Sunday was the perfect example of the green and white machine in full operation mode. It is all about the Celtic collective - management, players and supporters. They are all in it together. It's a powerful setup in any business. 

Celtic have now worked themselves into a position where it would take a collapse of Devon Loch proportions to blow the title at this late stage.

Four wins from the last six Premiership matches, including another win over Rangers at Parkhead in the final Glasgow Derby of the season, would see the Hoops take the chequered flag.

It is never over until it's over and the events of 2005 and Helicopter Sunday will serve as a timely reminder of that for those of a Celtic persuasion. However, the focus of attention has now turned to the possibility of Postecoglou's men completing a clean sweep in his inaugural campaign.

The two sides will meet at Hampden again in the Scottish Cup semi-final in two weeks. The mood music surrounding that particular fixture is tasting pretty sweet if you happen to support the green and white half of that divide.

Come Sunday April 17, Van Bronckhorst's Rangers may well be fighting to salvage the wreckage of a domestic season that most certainly wasn't supposed to turn out like this for the defending champions.

None of that is Postecoglou's concern. Celtic will travel to Hampden - the scene of their first domestic trophy success under him - in a buoyant and confident mood. Why wouldn't they?

To borrow another line from The Godfather trilogy after last season's aborted attempt at 10-in-a-row: in 10 short months, Postecoglou has shown that "revenge is a dish best served cold".

Can he mastermind a fantastic football trilogy of his own and claim the scalp of Rangers three times in the same month?

You wouldn't put it past him and his men to reel off a treble of wins against their rivals. Much in the same way that you wouldn't bet against him scooping the domestic treble in his first campaign as Celtic boss.

Celtic are currently 32 domestic matches unbeaten. It's a results-based business.

The best piece of that the club could conclude right now would be to get their manager to commit to a longer-term deal.

After all winning football matches is what Postecoglou and his Celtic team do best and what they have been about all season. It's not personal. It's just business.