Benfica have taken the sting out of the Dortmund attack in their desperate attempt to snatch a late away goal.
90' +1
All hands on deck for the home side at the back as Semedo is forced into a block to stop Schmelzer's cross on the left flank.
90'
Marc Bartra gets yellow.
Bartra goes into the book for a foul on Jimenez.
There will be four minutes of added time.
88'
OVER! Pulisic collects another loose ball on the edge of the box and shows great technique to bring the ball down and volley at goal. However, he puts his strike narrowly over the bar.
86'
Dembele sends the ball into the box from the flank and there are a few swipes from the Benfica defence before Semedo clears.
84'
C. Pulišić gets yellow.
SAVE! Ederson makes a brilliant save to rub salt into the Dortmund wounds. Pulisic lets fly with a strike from the edge of the box and it takes a huge deflection off Jimenez, but the keeper makes a reaction stop to keep the ball out.
Pulisic brings down Pizzi on the edge of the Benfica box and he goes into the book.
82'
G. Castro enters the game and replaces M. Reus.
C. Pulišić enters the game and replaces Raphaël Guerreiro.
Reus makes way for Castro.
Pulisic replaces Guerreiro for the visitors.
80'
The visitors are still dominating possession, but their lack of success in front of goal has dented their confidence in and around the box.
78'
Definitely not Dortmund's night as Schurrle makes a neat turn on the edge of the box, but he just cannot pull the trigger in time before Semedo and Luisao close him down. The full-back had a chunk of the German's shirt, but the referee did not see that!
Minute
Description
75'
R. Jiménez enters the game and replaces K. Mitroglou.
Jimenez replaces the goalscorer Mitroglou for the home side.
74'
M. Schmelzer gets yellow.
Schmelzer goes into the book for a foul on Salvio.
73'
The home side are encamped on the edge of the box, but you get the feeling we could play until tomorrow and Dortmund would not score.
71'
Benfica have the lead in this game, but have had one opening in front of goal. If a scoreline ever did not tell the story of a match - it's this game!
69'
WIDE! Piszczek rises highest in the box to head Dembele's corner at goal, but he can only guide his effort past the post.
68'
Dortmund are keeping the pressure on the home side, despite their poor form in front of goal this evening. There's no lack of effort.
67'
F. Cervi enters the game and replaces Rafa.
Rafa Silva makes way for Cervi.
66'
WIDE! Dembele runs at the Benfica defence and slides the ball out wide to Guerreiro, who sends the ball into the box. Reus meets the cross with his left foot, but can only guide his effort past the post.
63'
L. Fejsa gets yellow.
Fejsa brings down Guerreiro and heads into the book.
CHANCE! Sokratis fails to read the flight of the ball from Guerreiro's free-kick and can only watch as he is a yard away from the ball as it drifts past the post. Tuchel is furious on the touchline and who can blame him.
62'
A. Schürrle enters the game and replaces P. Aubameyang.
Aubameyang's awful evening is over as Schurrle replaces him.
60'
It's looking like it's going to be one of those nights for Dortmund. They've done everything but score, and Aubameyang has played a huge role in that.
58'
Penalty saved by Ederson!
SHOCKING PENALTY! Aubameyang is having a nightmare this evening. He continues his awful performance with one of the worst penalties you will see as he simply strikes the ball straight at Ederson, who makes the save.
Ederson makes a routine save from the spot, keeping the Gabonese's effort out.
57'
PENALTY TO DORTMUND! It has been coming and the pressure tells as Fejsa handles in the box, forcing the referee to point to the spot.
56'
SAVE! Dortmund are really coming at the home side now and only an excellent diving save from Ederson stops Piszczek from finding the net as his curling effort is tipped wide by the Benfica keeper.
55'
CHANCE! Reus sneaks off the back of Semedo on the left flank to latch on to Durm's cross and gets an effort away at goal, but Ederson makes a fine stop at his near post.
53'
WHAT A MISS! Aubameyang fails for the second time of the match to find the net from close range. Sokratis' pass was deflected into his path 12 yards from goal and with only Ederson to beat he scuffed his effort over the bar.
51'
CHANCE! Dortmund should be level as Dembele latches on to a flick-on from Reus in the box, but in a crowded area he fails to lift the ball over Ederson, who gets enough on the shot to deny the Frenchman.
48'
K. Mitroglou has scored a goal for Benfica! Assist by Luisão.
Luisao won the first header from the corner to tee up Mitroglou to find the net.
GOALLLLL!!! BENFICA TAKE THE LEAD! After doing nothing for the opening 45 minutes the home side have come to life to forge ahead in the contest. Luisao won the first header from Pizzi's corner and Mitroglou controlled the ball two yards from goal before placing his strike past Burki.
47'
Salvio has a dart down the right flank and wins a second corner of the half for the home side as Schmelzer covers.
46'
Filipe Augusto enters the game and replaces A. Carrillo.
Carrillo makes way at the break for Filipe.
We're back underway at the Estadio da Luz.
45' +3
The referee brings the first half to an end.
45' +2
Salvio makes a rare foray down the right flank and crosses to the near post, but Burki claims the ball with ease.
45'
Schmelzer sends a deep cross to the back post, and with Durm lurking behind him Eliseu heads the ball behind for a corner.
There will be three minutes of added time.
43'
Dembele attempts to pick out Aubameyang with his forward run, but he tries to squeeze the ball into too tight a space and it allows the home side to clear.
41'
Reus and Guerreiro combine in the final third, with the forward releasing the Portuguese in behind. However, Guerreiro moved a second too soon and was caught offside.
39'
Dembele attempts to latch on to a ball behind the Benfica defence and beats Ederson to it, only for the keeper to wipe him out in the process. The referee is unmoved as the ball trickles out for a goal-kick, much to the bemusement of every Dortmund player. That should have been a free-kick on the edge of the box.
38'
CLOSE! Fejsa allows Guerreiro to break in behind him and although he covers his mistake, he then lazily stops his work and the Portuguese swings his foot at the ball to send it across the face of goal. Unfortunately for Dortmund there's no player on hand to capitalise.
36'
Dortmund have completed 214 passes so far compared to Benfica's 86. The German outfit have dominated possession, holding 62% of the ball.
35'
Frustrating times at the moment for Benfica as they cannot get close to the German outfit with the ball. It's the travelling supporters who are making the noise inside the stadium.
33'
Dortmund are still controlling this match, with the home side sitting in their defensive shape to keep them at bay. Vitoria will want to see an improvement from his team going forward.
31'
Fejsa almost sells Ederson short on a backpass with Aubameyang pressing, but the Benfica keeper races out of his box to clear the danger.
29'
Schmelzer gets caught by Fejsa in an advanced position and goes down. Another chance for the German outfit to send a cross into the box.
Dortmund keep the ball on the ground and lose possession. For all of their good work this evening, Tuchel's men have not been clinical enough in the final third.
27'
Dortmund have dominated this contest thus far, but have nothing to show for it. They've quietened the crowd in the Estadio da Luz, but Tuchel remains a frustrated figure on the sideline.
25'
WIDE! Ederson punches the resulting cross clear to the edge of the box where Schmelzer waits. The skipper strikes the ball first time, but he scuffs his attempt well wide of the post.
24'
Ederson requires treatment for a knock to the mouth he took in the aftermath of the strike before the Dortmund corner can occur.
23'
SAVE! Ederson comes to the rescue for the home side as he makes a fine block to deny Dembele from close range. Dortmund played through the Benfica backline down the left and the Frenchman collected and fired first time at goal on the turn, but the keeper was there to make the save.
21'
Weigl sends an inviting ball over the top of the Benfica defence for Durm's run, but once again a lack of control lets a Dortmund player down as the ball trickles out for a goal-kick.
20'
Tuchel is shaking his head on the sideline after that piece of control from Guerreiro. His side have been in control thus far, but have not been clinical enough in the final third.
19'
Schmelzer and Bartra play sublime football down the flank, with the former knocking the ball to the edge of the box for Guerreiro's run, but the midfielder cannot take the ball in stride.
16'
Pizzi swings the ball into the box, but he gets his delivery all wrong and the visitors are able to clear with ease.
15'
Salvio goes down under pressure from Schmelzer and wins a free-kick on the right flank. An opportunity for the home side to test the fragile Dortmund defence.
14'
Guerreiro and Durm combine and the former almost releases Aubameyang behind the Benfica defence, only for Lindelof to make a vital interception.
13'
Dortmund are controlling the pace of the game in the early stages of the contest. Durm and Weigl are seeing a lot of the ball in possession on the right flank and centre of the park respectively.
11'
Reus wins a free-kick and has the opportunity to swing the ball in from the left flank, but his delivery misses everyone in the box and goes straight through to Ederson.
10'
CHANCE! Aubameyang misses a sitter as he blazes the ball over the bar from 12 yards with only Ederson to beat. Dembele won the ball back deep in the Benfica half and sent his team-mate through on goal, but the Gabonese failed to hit the target.
8'
Aubameyang attempts to latch onto Piszczek's ball over the top, but the offside flag goes up to stop the Gabonese's run.
6'
A frenetic start to the contest from both sides, displaying their attacking pedigree and defensive frailties.
5'
Luisao makes an important block to deny Dembele in the box as the Frenchman collected a low pass from Durm and went for the strike, but the veteran defender blocked his path.
CHANCE! Salvio collects the ball in acres of space on the right flank and he beats Sokratis for pace with ease. He lines up a strike, but gets his effort all wrong, sending the ball over the bar. A wasted opportunity.
4'
Schmelzer covers Rafa Silva's run to the near post, heading a cross from Semedo behind for a corner.
3'
Dembele takes possession twice in the final third in the space of a minute for the visitors, but loses it very easily. Not the best start for the Frenchman.
2'
Salvio makes an early raid down the right and he races to the byline to cut the ball back into the box, but Sokratis is on hand to clear the danger.
1'
We're underway at the Estadio da Luz.
Tuchel's men have not progressed beyond the round-of-16 since the 2013-14 season and will need to put in a stout display this evening in a raucous atmosphere in the Estadio da Luz.
Dortmund enjoyed an excellent campaign in the group stage, finishing above Real Madrid in Group F. Thomas Tuchel's men claimed four wins out of six, drawing twice with the Spanish giants on their way to the knockout phase.
Rui Vitoria's men were made to scrap for their place the first knockout round - just edging in front of Besiktas to secure their spot. The Portuguese outfit reached the quarter-finals of the competition last term and will be determined to overcome Dortmund starting with a strong display tonight.
Good evening and welcome to the live commentary of the Champions League clash between Benfica and Borussia Dortmund.
The team news has been announced and we'll start with the home side.
Benfica have made two changes from their win over Arouca last week. Eduardo Salvio and Rafa Silva come back into the side to replace Andrija Zivkovic and Jonas in the starting line-up.
Dortmund have made four changes from their defeat to Darmstadt 98. Lukasz Piszczek, Marcel Schmelzer, Ousmane Dembele and Marc Bartra are all recalled into the team to face the Portuguese outfit this evening.
STAT ATTACK! Dortmund have lost six of their last eight matches in the Champions League knockout stages.
The players are making their way out on to the pitch, so we should be underway shortly.
HALF-TIME: BENFICA 0-0 BORUSSIA DORTMUND
Borussia Dortmund will be frustrated heading into the interval as they've dominated the first half, but have not been able to find the back of the net. Pierre-Emerick Aubameyang should have put the visitors ahead, only to blaze his effort over the bar from close range.
Benfica have not got going at all in the first period and are fortunate to be level at the break. Rui Vitoria will want to see a lot more from his team in the second half.
The players are making their way out for the second half and a change is coming for the home side.
FULL-TIME: BENFICA 1-0 BORUSSIA DORTMUND
Benfica will take a 1-0 lead into the second leg at Signal-Iduna Park thanks to Kostas Mitroglou's goal in the 48th minute. How they have the advantage is anyone's guess as Borussia Dortmund spurned numerous chances, including a second-half penalty from Pierre-Emerick Aubameyang.
Thanks for joining our commentary this evening. Until next time, goodbye.
Thomas Tuchel will be furious with his side who now have to overcome a deficit to reach the quarter-finals of the competition. Rui Vitoria's men will have to display the same level of resilience when they travel to Germany for the second leg in three weeks time.
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