That brings an end to our live text coverage on another disappointing night for Scottish clubs in Europe.
Read our Celtic and Hearts match reports, scroll down for reaction, and visit their dedicated club pages to have your say.
We'll be back over the weekend with coverage of the domestic action.
Thanks for joining.
FT: Trabzonspor 2-0 Hearts
FT: Celtic 1-2 Celta Vigo
FT: Celtic 1-2 Celta Vigo
FT: Celtic 1-2 Celta Vigo
Pat Bonner
Former Celtic goalkeeper on BBC Sportsound
When Celtic got their goal, Celta upped the ante and Celtic didn't have an answer.
It should have been the other way round. Celtic should have been trying to get a second goal.
FT: Celtic 1-2 Celta Vigo
Here's more from Celtic boss Martin O'Neill at his post-match media conference...
On his biggest frustration: "Tonight is disappointing because I thought we could win the game. It was a tight match throughout. Before the game I thought we could win."
On his team struggling to deal with adversity: "I'm not sure about that and I'll have to really look at that again. [Conceding] was a blow to us because we were doing fine in the game. It's the small margins."
On Celtic being competitive enough in Europe: "If by the end of proceedings depending on amount of points we may or may not get, that is certainly up for debate."
FT: Celtic 1-2 Celta Vigo
James McFadden
Former Scotland forward on BBC Sportsound
Camilo Duran and Kasper Hogh scored goals in the Champions League last season, so they're more than capable.
They go ahead tonight and all you need to do is weather a bit of a storm.
Celta Vigo deserved to win the game. That's the problem for Celtic this season in Europe - the games they have lost, they have deserved to lose.
FT: Celtic 1-2 Celta Vigo
Hibs away on Sunday at 12:00 BST.
There's every chance they respond emphatically against a struggling Leith side, but what will that mean for their European campaign?
Nothing, it seems.
Image source, SNSFT: Celtic 1-2 Celta Vigo
Pat Bonner
Former Celtic goalkeeper on BBC Sportsound
I don't think Celtic are good enough, individually and collectively, to take on a team that's eighth in La Liga.
They moved the ball really well and Celtic couldn't get close to them.
They are not good enough at this level. Celtic are paying big money for some players because the fans are demanding it and then they come in and aren't good enough.
Even Camilo Duran, is he good enough at this level?
FT: Celtic 1-2 Celta Vigo
James McFadden
Former Scotland forward on BBC Sportsound
It seems as though Celtic struggle when there's a bit of adversity.
If something goes against them, the confidence drops, their heads drop, they stop playing forward.
The ball goes back and across, inviting pressure, and there's no way they take the pressure off. That has been a theme.
FT: Celtic 1-2 Celta Vigo
TNT Sports' coverage has just ticked off and the channel is now showing highlights of Celtic's Champions League victory over Juventus in 2001, during Martin O'Neill's first reign.
How things have changed.
FT: Celtic 1-2 Celta Vigo
Celtic boss Martin O'Neill tells TNT Sports: "We conceded a free-kick and I thought a second before that we should have had a foul for us. They score from the free-kick and it knocks us a little bit. It gave them a bit of momentum.
"I think if [Liam] Scales' header goes in to make it 2-0, we get the three points. We've lost three matches now, remarkably we're still in with a chance [of progressing]. We've got to win here and got to win away from home.
"We take the lead in the game, if we get the second goal we win the match and it changes the whole dynamic.
"It didn't happen, that's it - we need to try to find a way to win European games."
Image source, SNS
FT: Celtic 1-2 Celta Vigo
Flat-track bullies? Flat-pack furniture more like. Difficult to build up and they collapse too easily.
Liam
We’re such a weak side in the middle of the park. I hate to say it, but McGregor is way off it at this level.
David
The club have got big-fish-in-small-pond syndrome. After years of little meaningless victories and getting one over on our rivals, the mismanagement - on every single level - has caught up to us. Fading into obscurity.
James
So weak all over the park. We can’t win a tackle, lose every first and second ball. Losing for 20 minutes at home and did we even force a save from the keeper? Very, very poor team.
Eddie
FT: Celtic 1-2 Celta Vigo
Tom English
BBC Scotland's chief sports writer
It's yet another reminder that domestic form is a very poor indicator when it comes to Europe.
I go back to the line Chris Sutton used and I agree with him - flat-track bullies.
Their relevance in Europe is fading into nothing. It's embarrassing for Celtic.
FT: Celtic 1-2 Celta Vigo
It says something about Celtic's set-up that Liam Scales (121) had by far the most touches for the hosts.
Kieran Tierney (79) and Sam Johnstone (69) were second and third, respectively.
FT: Celtic 1-2 Celta Vigo
Celtic midfielder Mika Baur tells TNT Sports: "How we played second half, last 30 minutes, we deserved it in the end.
When asked if he knew why his team collapsed in such a manner, he responded: "I cannot tell you, sorry.
"It can happen that you get a goal, they can score too, good team - you should then get control back, hold the ball a bit longer to take the momentum away from them. You should break that."
When asked if he feels if it's possible for Celtic to progress, he adds: "What else should we do? Absolutely. We need points. That's it."
Image source, SNSFT: Celtic 1-2 Celta Vigo
Celtic have now lost their past four European matches, conceding 14 goals across them.
According to Opta, they had only lost four in a row within a single season in Europe once before, doing so in the 2017-18 Champions League.
They've matched that unwanted record tonight.
Celtic 1-2 Celta Vigo
That Celta were worth their win.
More than double the amount of shots, more than double the amount of expected goals, and more than 56% of the ball.
FT: Celtic 1-2 Celta Vigo
James McFadden
Former Scotland forward on BBC Sportsound
The performances at this level haven't been good enough. Celtic are way short at this level.
Salah coolly dinked the home side into the lead from the penalty spot
At a glance
Injury-stricken Hearts start striker Rogers Mato at left back up against Mohamed Salah
Salah chips in composed first-half penalty as hosts make dominance count
Franculino Dju doubles lead with curling attempt, assisted by Salah
Trabzonspor have Sidny Lopes Cabral red carded late on
Mohamed Salah scored one and set up the other as Trabzonspor proved too strong for Hearts in the Conference League.
The Liverpool legend dinked in a first-half penalty before teeing up Franculino Dju to fire in a magnificent second after the interval in an efficient display from the Turkish side.
Hearts, depleted by numerous injuries to key first-team players, were lost full-back Harry Milne in training on the eve of this game and lined up with attacker Rogers Mato as their left-back.
And defender Christian Borchgrevink was forced off through injury on the stroke of half time as head coach Wouter Vrancken's squad was further diminished.
Off the back of their 7-1 Scottish Premiership humbling by Celtic on Sunday, Hearts were under pressure to respond and should have taken an early lead when Malachi Fagan-Walcott hit a post with a free header.
However, Trabzonspor grew into the game and after two initial penalty claims were denied - the first for a close offside in the build-up - Salah stepped forward to slot his spot-kick down the middle of Beau Reus' goal.
Franculino, who won the penalty when he was felled by Tomas Magnusson, curled into the far corner to double the lead after a well-weighted one-two with Salah.
The whipped strike, coming just shy of the hour, put paid to any faint Hearts hopes of a comeback as they remain winless in the competition.
Josh McPake flashed wide as the game petered out, and the hosts' Sidny Lopes Cabral was shown a second yellow card for being a touch late on Sabah Kerjota.
Hearts remained diligent in their pressing and application, showing resilience and signs of a fightback from their chastening weekend.
Undeterred by their unorthodox line-up and the stature of the opponents, Hearts made a commendable start, with one player singled out more than any other.
Not the Champions League and multiple Premier League winner Salah, but his direct opponent, Mato.
The Ugandan international was rumoured to be the starting left-back in the build-up, but few reckoned it would be reality until he was marking the Egyptian up and down the flank. Impressively so, too.
Salah, who left Liverpool last summer, joined the Turkish side as a free agent and was the player Hearts feared the most, but the home side are littered with quality and currently sit just three points off Galatasaray in their domestic league and have now won back-to-back Conference League games.
Mato kept Salah quiet for a chunk of the opening 45 minutes before the Trabzonspor captain first made an impact as his cross struck a Hearts' arm, but no penalty was awarded after a lengthy VAR intervention.
By his standards, he was relatively quiet for the 71 minutes he was on the park, but the guile to convert his penalty and the poise to assist the second goal are a testament to his quality.
Hearts 'bounced back from weekend' despite defeat by Trabzonspor
Hearts head coach Wouter Vrancken: "Against this individual quality was a real team today. I was really proud of the performance."
On starting Rogers Mato at full-back: "I knew he could match up the pace there and also I know that Rogers, when he's focused, that he's really strong in one-on-one duels especially for an offensive player.
"So happy to see that it worked out, because if Salah scores two, three times, everybody says it was a wrong decision and not a good one, but yeah, you have to have confidence in some guys.
"And when you see some guys playing out of position because the need was there, we had only one midfielder left to play, six injured.
"So happy to see those things happening and that we can bounce back from the result of last weekend and have a good team performance."
After the opportunity to rate players has closed, the score displayed represents the average from all the submissions by BBC Sport users.
| Team | Played | Won | Drawn | Lost | Goals For | Goals Against | Goal Difference | Points | Form, Last 6 games, Oldest first |
|---|---|---|---|---|---|---|---|---|---|
1 Panathinaikos | 2 | 2 | 0 | 0 | 7 | 2 | 5 | 6 |
|
2 Lugano | 2 | 2 | 0 | 0 | 8 | 4 | 4 | 6 |
|
3 Brann | 2 | 2 | 0 | 0 | 6 | 2 | 4 | 6 |
|
4 Trabzonspor | 2 | 2 | 0 | 0 | 6 | 2 | 4 | 6 |
|
5 Twente | 2 | 2 | 0 | 0 | 5 | 1 | 4 | 6 |
|
| 2 | 2 | 0 | 0 | 5 | 1 | 4 | 6 |
| |
7 Sint-Truiden | 2 | 2 | 0 | 0 | 3 | 0 | 3 | 6 |
|
8 Hajduk Split | 2 | 2 | 0 | 0 | 3 | 1 | 2 | 6 |
|
| 2 | 1 | 1 | 0 | 4 | 0 | 4 | 4 |
| |
10 Copenhagen | 2 | 1 | 1 | 0 | 5 | 2 | 3 | 4 |
|
11 Universitatea Craiova | 2 | 1 | 1 | 0 | 4 | 2 | 2 | 4 |
|
12 Mjällby | 2 | 1 | 1 | 0 | 3 | 1 | 2 | 4 |
|
13 Ajax | 2 | 1 | 0 | 1 | 3 | 2 | 1 | 3 |
|
14 Borac Banja Luka | 2 | 1 | 0 | 1 | 3 | 2 | 1 | 3 |
|
| 2 | 1 | 0 | 1 | 3 | 3 | 0 | 3 |
| |
16 Sporting Braga | 2 | 1 | 0 | 1 | 2 | 3 | -1 | 3 |
|
17 Gent | 2 | 1 | 0 | 1 | 1 | 2 | -1 | 3 |
|
18 Freiburg | 2 | 1 | 0 | 1 | 3 | 5 | -2 | 3 |
|
19 Nordsjælland | 2 | 0 | 2 | 0 | 3 | 3 | 0 | 2 |
|
20 Egnatia Rrogozhinë | 2 | 0 | 2 | 0 | 2 | 2 | 0 | 2 |
|
21 Riga | 2 | 0 | 2 | 0 | 2 | 2 | 0 | 2 |
|
22 Red Star Belgrade | 2 | 0 | 1 | 1 | 4 | 5 | -1 | 1 |
|
23 CSKA Sofia | 2 | 0 | 1 | 1 | 3 | 4 | -1 | 1 |
|
24 Jablonec | 2 | 0 | 1 | 1 | 2 | 3 | -1 | 1 |
|
25 Midtjylland | 2 | 0 | 1 | 1 | 1 | 2 | -1 | 1 |
|
26 AGF | 2 | 0 | 1 | 1 | 1 | 2 | -1 | 1 |
|
27 Pafos | 2 | 0 | 1 | 1 | 2 | 4 | -2 | 1 |
|
| 2 | 0 | 1 | 1 | 1 | 3 | -2 | 1 |
| |
29 Iberia 1999 | 2 | 0 | 1 | 1 | 1 | 3 | -2 | 1 |
|
| 2 | 0 | 1 | 1 | 3 | 6 | -3 | 1 |
| |
31 Kairat | 2 | 0 | 1 | 1 | 2 | 6 | -4 | 1 |
|
32 Thun | 2 | 0 | 0 | 2 | 0 | 2 | -2 | 0 |
|
33 Lincoln Red Imps | 2 | 0 | 0 | 2 | 2 | 6 | -4 | 0 |
|
34 KuPS | 2 | 0 | 0 | 2 | 2 | 6 | -4 | 0 |
|
35 Inter Club d'Escaldes | 2 | 0 | 0 | 2 | 1 | 5 | -4 | 0 |
|
36 Kauno Žalgiris | 2 | 0 | 0 | 2 | 1 | 8 | -7 | 0 |
|
Manager: Thomas Reis
Formation: 4 - 3 - 3
Manager: Wouter Vrancken
Formation: 4 - 4 - 2
Manager: Thomas Reis
Formation: 4 - 3 - 3
Manager: Wouter Vrancken
Formation: 4 - 4 - 2
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