The Swede set Celtic on their way and Duran’s double did the rest, a gorgeous volley – on the back of hustling and harassing of the LASK defence – and then that sumptuous team goal that rounded it off.

O’Neill said the club has a bargain in Duran and the early signs are that he was an absolute steal at somewhere between £4.5m and £6m, depending on who’s talking.

The Colombian has intelligence and guile but he’s also got the work-ethic that means every bit as much as his other qualities.

In the 72nd minute, Celtic were 3-0 ahead, and yet there the 24-year-old was darting back into defence to help out, tracking LASK men until they were hounded out of possession.

As much as his goals, his lung-busting effort to put in a shift made him a hero of the night for Celtic people. Honesty counts for a lot.

It’s easy to say that Celtic learned their lesson from a year ago and splashed the cash. They spent close to £30m and now they’re getting their reward. It’s never that simple.

Spending is something that Celtic have done a lot of over the years. Spending wisely has been their problem. Splurging money on last-minute loans who, surprisingly, turn out to be duds.

Forking out multiple millions on recent and not so recent failures – from Balikwisha to Barkas – has been the problem. The decision-making has been awful too often.

Duran represents a return to form, a reminder of the days when they found value, mostly under Ange Postecoglou.

We’re too quick to write off players and we can also be too quick to brand them as stars in waiting. You should tread carefully at all times. With Duran we’ll take the plunge – this guy looks special.

Beyond offering a physical distraction, Kasper Hogh was quiet against LASK, but he will score plenty in the weeks and months ahead. At £11m, he, too, looks like money very well spent.