Celtic suffered further European disappointment as goals in each half and a controversial disallowed equaliser earned Sporting Braga victory in a chaotic Europa League encounter at Parkhead.

Kasper Schmeichel had an error-strewn game in goal and failed to keep out Ricardo Horta's early long-range effort, which stunned the Celtic Park crowd into silence.

The Dane then did well to keep out a late shot but was helpless when the ball bounced off Gabri Martinez in a botched clearance and rebounded into the net to seal all the points.

After their Champions League qualification failure against Kairat Almaty, and an opening Europa League draw with Red Star Belgrade, this continued Celtic's disappointing start to their European campaign.

In fact, so sharp has been the drop-off since last season, that Brendan Rodgers' side may struggle to qualify for the latter stages of the Europa League unless they can find their way again, and quickly.

This was a match Braga dominated for long spells in the first half, prompting Rodgers to change his formation after the break in the hope that a back three and extra men in the middle might solidify his side.

The Scottish champions showed improvement thereafter and thought they had equalised when Kelechi Iheanacho calmly slotted home after a mistake from the Braga backline.

His celebrations were ended by referee Tobias Stieler blowing for handball, a decision backed up by a lengthy video assistant referee (VAR) check, although footage appeared to show the ball did not hit a hand.

Braga then had goalkeeper Lukas Hornicek to thank for two super stops as Celtic ramped up the pressure in search of an equaliser.

First, he leapt to his left to keep out a Kieran Tierney header, before hurling himself to the other corner to tip away Sebastian Tounekti's curling effort which looked destined for the net.

After the change of formation, Rodgers then threw on several substitutes - including Reo Hatate, Arne Engels and James Forrest - but no-one could conjure the quality to find the goal Celtic needed.

Celtic showed they're not good enough for the Champions League by failing to score in 210 minutes against Kazakh side Kairat.

Their credentials for the Europa League have now been given a thorough examination by the side sitting seventh in the Portuguese top flight.

Braga are a decent side, and have now beaten both Celtic and Feyenoord in their opening matches in this league phase.

They're far from an elite European outfit, though, and this defeat will sting for Celtic if they have any ambitions to be playing in the competition's knock-out phase.

One point from the first available half dozen will not do, and there was a certain chaos and vulnerability about Rodgers' men which the manager will not have liked.

His team were so comprehensively outplayed for much of the first half that he even abandoned his trusted 4-3-3 formation to go to a back three with wing-backs.

It couldn't inspire a goal and this toothless aspect to Celtic will trouble the manager. They couldn't stop scoring last season. It's a real struggle for them this term.

Celtic manager Brendan Rodgers: "I can't understand why the referee isn't asked to go and have a look at that [Iheanacho's disallowed goal].

"If you look at it once, twice, I'm assuming the people in the VAR room have looked at it more than that, there's absolutely no way whatever way you look it that Iheanacho has touched it. That's a huge moment in the game.

"There's been too many games now where we haven't scored for a team that, last season, scored the most goals in the last 54 years in the clubs' history. It's my responsibility to find the solutions to that."

Former Scotland forward James McFadden: "It was a poor Celtic performance. Lacking quality, something we're not used to seeing. I think the change of shape at half-time helped a little bit, but in the end Braga deserved the win."

Former Celtic midfielder Stiliyan Petrov: "It was all over the place from Celtic. Even Schmeichel - he can play with the ball, but he gave it away and made a lot of mistakes."

Celtic are back to domestic business on Sunday, with Jens Berthel Askou's new-look Motherwell making the trip to Glasgow on Scottish Premiership duty (15:00 BST).