That brings our live text coverage to an end on an underwhelming night for our Scottish clubs in Europe.
Read our match reports from Celtic's defeat and Hearts' draw, and visit their dedicated club pages to have your say on the matches.
And you can scroll down for reaction from the managers, pundits and more.
Thanks for joining. We'll be back over the weekend.
FT: Benfica 4-1 Celtic
Some more from Celtic boss Martin O'Neill before we finish up. He says he thinks Duran's "strongest position is through the middle".
What does that mean for Kasper Hogh?
"[Duran] has played wide at his previous clubs," O'Neill adds. "But I personally feel his best position is through the middle.
"It's now a matter of us trying to fit him in and I think we can do that. It's a real battle for places now."
Image source, SNSFT: Hearts 1-1 Nordsjaelland
Hearts head coach Wouter Vrancken tells BBC Scotland: "Not so much frustration, more disappointment because of the late goal. And also because we couldn't show anything more in the last 20 minutes.
"I expected a bit more energy there, when you make substitutions. We lost energy instead of gaining it, and that's not what we need.
"It had to be 2-0 or 3-0 at half-time. Even in the second half, we had moments we have to exploit and do better. Then you kill the game, and you're confident and comfortable.
"As long as the second goal isn't there, you know you're taking more of a risk and there's an all-or-nothing feeling. Then we have to put energy against this, because there's spaces to exploit for us."
Image source, SNSFT: Benfica 4-1 Celtic
'I'd pick Duran over Hogh every day of the week'
Chris Sutton
Former Celtic striker on X
That feeling of apathy once again tonight. Nobody surprised by the outcome... Flat-track bullies.
FT: Benfica 4-1 Celtic
Fair to say Chris Sutton isn't feeling as jovial as his former manager...
FT: Hearts 1-1 Nordsjaelland
Ryan Stevenson
Former Hearts forward on BBC Sportsound
First half was brilliant and if Hearts had managed to get the second goal before the break, they'd have been out of sight.
Second half, they just never really got going. When it got to about 83 minutes, the full stadium was hoping they could see it out, grind it out, and get the 1-0 victory.
They never managed to do that, which was disappointing. It's still a point, the manager will go over things, but they don't have much time.
They just have to put it to bed and get ready to go again on Sunday.
FT: Benfica 4-1 Celtic
Celtic manager Martin O'Neill tells TNT Sports: "Last thing you want to do is concede so early on. We could've capitulated, but I thougt the second-half performance was terrific. We created chance after chance.
"The second-half performance gives me the determination... I think we can still qualify. We can still do it.
"We came roaring back, the subs came on and did brilliantly. We could've scored a number of goals. It changed because two wide players really wanted to get at people.
"I accept on the break they could have scored themselves, as they did with their fourth goal."
When asked if he will take his side's second-half showing into Sunday's encounter with Hearts, he responds: "Absolutely."
FT: Benfica 4-1 Celtic
Celtic boss Martin O'Neill has also been giving his post-match verdict.
He is very upbeat about his team's second-half showing...
FT: Benfica 4-1 Celtic
Image source, SNSCeltic captain Callum McGregor tells TNT Sports: "Disappointing result. We were here to get points and win.
"We were playing against a really good side with with really good quality in final third. First half we didn't help ourselves.
"Second half we score one, probably could score another. Bit of a game of two halves.
"Unforced errors lead to the second and third goals and you have a mountain to climb.
"We know at this level if you don't look after the ball you're going to get punished."
FT: Benfica 4-1 Celtic
Scott Allan
Former Celtic midfielder on BBC Sportsound
For me if I'm a creative midfield player and I've got Camilo Duran and Kasper Hogh to pick from to play up front, I'm taking Duran every day of the week.
FT: Hearts 1-1 Nordsjaelland
Hearts winger Josh McPake tells TNT Sports: "Bit of a gutter, to be fair. I thought for 75 minutes we did really well.
"We took our foot off the gas. I don't want to make any excuses for us. That was down to us. They are a good team with good quality and good players.
"They punished us. that's what happens. I think this team can keep going."
Image source, SNSFT: Hearts 1-1 Nordsjaelland
Some instant reaction from Hearts boss Wouter Vrancken on TNT Sports: "[We played a] really good game, really dominant, really dominant out of possession also.
"In Europe you have to finish [your chances]. We had good moments. We showed ourselves in Europe."
On the trust he has in his squad to handle a hectic schedule with a trip to Celtic to come on Sunday, he adds: "[The players] have showed already they are ready to take over.
"But they are human beings. You can't always be top every day or in every moment. The games are coming fast."
Image source, SNSFT: Hearts 1-1 Nordsjaelland
Ryan Stevenson
Former Hearts forward on BBC Sportsound
In the second half Hearts got what they deserved. They never really got going. First half I thought they were outstanding. I think Hearts will be bitterly disappointed looking back on their chances missed.
FT: Benfica 4-1 Celtic
Thankfully Benfica stopped trying so hard after three, bit like most of the Celtic players. Defensively we are shocking and that starts from the forwards. Really worried about next few weeks.
Alec
Celtic's defence is shocking. Maybe people will understand why the fans are demonstrating against Dermot Desmond. They need players in the defensive positions, but the Celtic board have failed again and again to strengthen.
Jonnie
FT: Benfica 4-1 Celtic
After just two games, no team has conceded more goals than Celtic (seven) in the Europa League this season.
Including the second-leg Champions League play-off collapse at LASK, that's now 12 goals shipped in their past three European matches.
Image source, SNSNext up for these sides?
They meet each other at Celtic Park on Sunday, five months on from that dramatic title decider in May.
Celtic have lost four of their past five matches in all competitions
At a glance
Duran double, either side of Bah volley, puts Benfica three up at half-time
Celtic much improved after the break and pull one back through Duran but Pavlidis scored late fourth
O'Neill's side have lost their opening two Europa League games
Celtic slumped to a fourth defeat in five matches as Benfica swept to a comprehensive Europa League victory in Lisbon.
Former Aston Villa striker Jhon Duran's double and Alexander Bah's volley put Marco Silva's side 3-0 up at half-time as a ramshackle Celtic were picked apart time and time again.
The Scottish champions were fortunate not to be further behind, but improved after the break and pulled one back through Camilo Duran's brave header.
Martin O'Neill's outfit pushed for a second goal that would have given them hope, but Duran struck a post with a left-footed drive and Callum Osmand had a shot well saved by home goalkeeper Anatoliy Trubin.
However, in the closing stages, Benfica added further gloss to the scoreline as substitute Vangelis Pavlidis scuffed a shot past the flat-footed Viljami Sinisalo.
Benfica are third in the standings with two wins from two, while Celtic are 34th of 36 teams after two losses.
Before the international break, Rangers deservedly beat Celtic home and away and Ferencvaros came out on top at Parkhead in Europe.
After an improved result and performance at Motherwell on Sunday - which returned them to the top of the Scottish Premiership - there was hope Celtic had put those woes behind them.
But they trailed inside five minutes at Estadio da Luz. Dane Murray committed a careless foul on Duran and the Benfica striker dusted himself down to dink a delightful penalty past Sinisalo.
Benfica's second came after more sloppy defending as Sebastian Tounekti failed to track Bah's run into the Celtic box and the Dane found the bottom corner.
It was almost three straight from kick-off as Duran fired into the side netting, but Celtic failed to heed that warning as Prestianni played Duran through minutes later and the Colombian striker beat Sinisalo from a tight angle.
It was alarmingly easy for a classy Benfica outfit to cut through Celtic, as reflected by their 26 shots at goal - 21 of those coming in the opposition box.
O'Neill withdrew club-record signing Kasper Hogh - who has now failed to score in 10 of his first 11 Celtic appearances - and Tounekti at half-time as he searched for a much-needed spark.
The introduction of Haissem Hassan and Osmand had the desired effect. Hassan shot straight at Trubin and teed up Duran's goal, but Benfica continued to create chances seemingly at will.
Andreas Schjelderup rattled the post and Pavlidis added the fourth goal the hosts' play deserved late on.
Admittedly, this was not a game Celtic were expected to win, but they failed to even compete for long periods and were their own worst enemy at times with unforced errors.
They host Hearts in the league on Sunday in a big test before returning to European action against Celta Vigo.
O'Neill says Celtic are determined to make it to knockout stages
Celtic manager Martin O'Neill: "Last thing you want to do is concede so early on. We could've capitulated, but I thought the second-half performance was terrific. We created chance after chance.
"The second-half performance gives me the determination... I think we can still qualify. We can still do it.
"We came roaring back, the subs came on and did brilliantly. We could've scored a number of goals. It changed because two wide players really wanted to get at people.
"I accept on the break they could have scored themselves, as they did with their fourth goal."
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 |
|---|---|---|---|---|---|---|---|---|---|
| 2 | 2 | 0 | 0 | 7 | 1 | 6 | 6 |
| |
| 2 | 2 | 0 | 0 | 6 | 0 | 6 | 6 |
| |
3 Benfica | 2 | 2 | 0 | 0 | 6 | 1 | 5 | 6 |
|
4 Beşiktaş | 2 | 2 | 0 | 0 | 7 | 3 | 4 | 6 |
|
| 2 | 2 | 0 | 0 | 5 | 1 | 4 | 6 |
| |
6 Omonia Nicosia | 2 | 2 | 0 | 0 | 4 | 0 | 4 | 6 |
|
7 Ferencváros | 2 | 2 | 0 | 0 | 5 | 2 | 3 | 6 |
|
| 2 | 2 | 0 | 0 | 5 | 3 | 2 | 6 |
| |
| 2 | 2 | 0 | 0 | 3 | 1 | 2 | 6 |
| |
10 Olympiakos | 2 | 2 | 0 | 0 | 3 | 1 | 2 | 6 |
|
11 Sparta Prague | 2 | 1 | 1 | 0 | 5 | 2 | 3 | 4 |
|
12 Union Saint-Gilloise | 2 | 1 | 1 | 0 | 4 | 1 | 3 | 4 |
|
| 2 | 1 | 1 | 0 | 2 | 1 | 1 | 4 |
| |
14 Dinamo Zagreb | 2 | 1 | 1 | 0 | 1 | 0 | 1 | 4 |
|
| 2 | 1 | 0 | 1 | 6 | 3 | 3 | 3 |
| |
| 2 | 1 | 0 | 1 | 4 | 2 | 2 | 3 |
| |
17 Jagiellonia Białystok | 2 | 1 | 0 | 1 | 4 | 3 | 1 | 3 |
|
18 OFI Crete | 2 | 1 | 0 | 1 | 3 | 2 | 1 | 3 |
|
19 Torreense | 2 | 1 | 0 | 1 | 3 | 3 | 0 | 3 |
|
20 AZ Alkmaar | 2 | 1 | 0 | 1 | 2 | 2 | 0 | 3 |
|
21 Red Bull Salzburg | 2 | 1 | 0 | 1 | 1 | 4 | -3 | 3 |
|
22 Lillestrøm | 2 | 0 | 1 | 1 | 2 | 3 | -1 | 1 |
|
| 2 | 0 | 1 | 1 | 2 | 3 | -1 | 1 |
| |
24 Hapoel Be'er Sheva | 2 | 0 | 1 | 1 | 1 | 2 | -1 | 1 |
|
25 Levski Sofia | 2 | 0 | 1 | 1 | 1 | 2 | -1 | 1 |
|
26 Sturm Graz | 2 | 0 | 1 | 1 | 0 | 3 | -3 | 1 |
|
27 NEC Nijmegen | 2 | 0 | 1 | 1 | 1 | 6 | -5 | 1 |
|
28 Anderlecht | 2 | 0 | 0 | 2 | 1 | 3 | -2 | 0 |
|
29 Celta Vigo | 2 | 0 | 0 | 2 | 1 | 3 | -2 | 0 |
|
| 2 | 0 | 0 | 2 | 2 | 5 | -3 | 0 |
| |
| 2 | 0 | 0 | 2 | 1 | 5 | -4 | 0 |
| |
32 Viktoria Plzeň | 2 | 0 | 0 | 2 | 1 | 5 | -4 | 0 |
|
33 Ararat-Armenia | 2 | 0 | 0 | 2 | 2 | 7 | -5 | 0 |
|
| 2 | 0 | 0 | 2 | 2 | 7 | -5 | 0 |
| |
35 Celje | 2 | 0 | 0 | 2 | 0 | 5 | -5 | 0 |
|
36 Lech Poznań | 2 | 0 | 0 | 2 | 0 | 8 | -8 | 0 |
|
Manager:Marco Silva
Formation:4 - 2 - 3 - 1
Manager:Martin O'Neill
Formation:4 - 2 - 3 - 1
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