The Danish wideman was sent off 10 minutes into the second half for another dive and as the game swung from end to end Evander levelled for the visitors in the 66th minute with a whipped-in free-kick to set up nicely next week's second leg in Denmark, with the away goals rule not applying this season.

Celtic's biggest home crowd since coronavirus restrictions came into place in March 2020 lent a raucous atmosphere to their side's first meaningful game of the campaign.

Postecoglou had voiced concerns over his squad's fitness and over how long it was taking to get new faces into his under-strength squad but he fielded almost his most experienced team.

There was a familiar face in the opposition, former Hoops defender Erik Sviatchenko, who captained the Danish side.

There was some concern for Postecoglou in the 10th minute when Bitton, after some treatment to a face injury following a challenge by striker Junior Brumado, went up the tunnel leaving the Hoops with 10 men.

Moments later, Raphael Nwadike also went off with a head injury after a challenge by Anthony Ralston and both sides were a man down before both casualties returned to the fray.

In the 24th minute striker Odsonne Edouard fired a shot on the turn over the bar from the edge of the box.

The match burst into life in the 36th minute, however, when Hoops attacker Ryan Christie struck the post from close range from Abada's cross and then headed over from the same player's delivery.

A minute later, Abada showed how it should be done when he swiftly flashed a rebound into the net after Midtjylland keeper Jonas Lossl parried a powerful drive from Christie.

More drama soon followed.

Bitton, booked earlier for a foul on Brumado, was sent off by referee Sandro Scharer for lifting his hand to Dreyer after the Midtjylland player appeared to go down too easily in the box.

Dreyer was also booked while 18-year-old defender Dane Murray replaced Abada to make his competitive debut as Postecoglou reshuffled.

The Celtic fans cheered when the Danish winger received another yellow when he went down at the edge of the box under the close attention of new Hoops captain Callum McGregor.

Then, as the belief returned to Parkhead, the Scotland midfielder skimmed the bar from the edge of the box with a terrific drive before Edouard was put through only to hit Lossl with an unconvincing strike – and Celtic soon paid for that miss.

After being brought down by Celtic defender Stephen Welsh 10 yards in from the byline on the left, Brazilian midfielder Evander, who had come close minutes earlier with a drive, hammered his free-kick in off the far post with questions around Parkhead keeper Vasilis Barkas.

More huffing and puffing ensued but the tie remains up for grabs.