Ange Postecoglou's Celtic were booed off as their winning streak at home came to a screeching halt against Dundee United.

Despite their struggles on the road, the Parkhead outfit have enjoyed home comforts with dominant performances at Celtic Park.

The Tannadice men had something to say about that as Ian Harkes' strike cancelled out Liel Abada 's opener.

It means Celtic remain in sixth spot in the table, failing to leapfrog their visitors in the Premiership and ceding more ground in the title race early on in the season.

Albian Ajeti had a brilliant chance to open the scoring after United left him unmarked within the opening 10 minutes.

Good work by Anthony Ralston on the right flank saw the full-back hit the byline and find the striker in the six-yard box, however his pacy cross was headed over the bar.

The Swiss striker was at the heart of the action once again as David Turnbull fizzed a low cross from the left flank into the area. As the lone frontman looked to pull the trigger, a moment of hesitation allowed Kerr Smith to take the ball off his toes.

The hosts would take the lead when Jota whipped the ball into a dangerous ball across the box and Abada cushioned the ball into the net to open the scoring.

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But moments later, Harkes would level as Ilmari Niskanen shrugged off Ralston's challenge to cut inside and find the striker unmarked. He thundered an impressive header into the top corner and out of the reach of Joe Hart from point blank range.

Almost instantly, Ajeti had another brilliant chance as quick feet from Abada unlocked the Tannadice defence on the right wing. He found the attacker just yards from goal and he somehow blazed the ball high and wide.

Carl Starfelt was then caught out by the high press by Peter Pawlett, as he cut the ball inside to Nicky Clark. The striker was through on goal, but tumbled under pressure from Cameron Carter-Vickers with Kevin Clancy uninterested.

Turnbull was next up to try his luck as the Scotland cap beat Smith with a great bit of skill and unleashed a piledriver that had Benjamin Siegrist beaten, but his shot came bouncing off the bar.

From the second half restart Abada was pushing to put Celtic back into the lead. A mazy run from the teenage winger saw space open up in front of him, but his dinked effort sailed narrowly over the bar.

Niskanen looked to match his counterparts efforts as he was rolled the ball by Harkes, as the Finn cut past Ralston and curled his strike just wide of the far post.

Abada was again the stand-out for Celtic as his surging run left Scott McMann chasing his shadow, with the Israeli chipping the ball on to the head of Ajeti from the right wing. The striker miscued the header and couldn't guide the ball towards goal, and another chance went begging.

The United defence then opened up for substitute Adam Montgomery as the flashed the ball across the goal line from the left wing, but there were no takers in the middle for the tap-in.

Tom Rogic would then strike the wood work again as he headed Jota's cushioned cut-back toward goal, but it struck the underside of the cross bar.

In injury time Jota to cut-in and whip a brilliant effort toward goal from range. It crashed off the bar once again to cap off a frustrating afternoon for Celtic

Here are three talking points from the clash in Glasgow's east end:

Injury woes mounting

Earlier this week Ange Postecoglou joked that he must have walked under a ladder with the amount of injury problems facing the club. Now with Josip Juranovic limping off the Australian could have smashed a mirror too as the bad luck continues to pile up. The Croat looked to be holding his calf as he limped off to be replaced by Adam Montgomery after just 25 minutes. James McCarthy was also replaced at the break after a couple of heavy challenges and his situation remains unclear. It gives the boss another headache heading into the Europa League showdown with Bayer Leverkusen.

Ajeti struggling to make his case

Albian Ajeti will have been crying out for a chance to get a run in the Celtic team, having played second fiddle to Odsonne Edouard, Leigh Griffiths and Kyogo Furuhashi throughout his time in Glasgow's east end. With the Japanese international out, and Greek striker Giorgos Giakoumakis also sidelined, he has now had that run in the team. Fans will still be scratching their heads and wondering how the striker missed from Liel Abada's cross just a couple of feet from goal. It's hard to imagine his display has strengthened any argument to be in the starting eleven.

United proving no pushovers

When Tam Courts was appointed as Dundee United boss, there were few that were happy on the terraces of Tannadice with the choice. Having only managed at Kelty Hearts, it seemed like a huge step up and a gamble by the board. At this point, it seems more like a stroke of genius. They are well-organised and caused Celtic plenty of problems throughout the afternoon as well as looking solid at the back despite missing key man Charlie Mulgrew.