It looks like Dortmund might play out the last few minutes of this match a man down now. Hummels is not in good shape, out to the left of his side's goal where doctors are attending his foot. Play resumes.
90'
There will be four added minutes here, in a last-minute change after the board suggested three. Hummels is down after his foot was accidentally stood on and he has to hobble off.
88'
A. Witsel enters the game and replaces J. Bellingham.
Dortmund make another change now as Bellingham is replaced by Axel Witsel.
87'
Immobile! The Lazio man is nearly the hero of the hour once again as he volleys a blinder of an effort in, which Burki does admirably well to parry. A fine shot and a fine stop.
86'
Bellingham lets fly with an effort from outside the box which Reina dangerously bobbles. Two Lazio defenders have him covered though, helping him to regather without pressure.
84'
Dortmund have strung together over 200 more passes than Lazio today. They've tried to use that to undercut the visitors and they've stubbornly refused to be cowed.
82'
End-to-end stuff as both sides ping between each other's boxes, looking for that vital third goal of the game. A strike at this point is surely a winner-takes-all one.
80'
The visitors also bring off Alberto and thrown on Gonzalo Escalante to replace him.
Looking for a late winner, Lazio replace Milinkovic-Savic with Felipe Caicedo now.
79'
F. Caicedo enters the game and replaces S. Milinković-Savić.
G. Escalante enters the game and replaces Luis Alberto.
Minute
Description
78'
Bellingham! The England man nearly poaches an effort after a free-kick set-piece just outside the Lazio box falls kindly to him. Under pressure though, he puts it wide.
76'
J. Brandt enters the game and replaces T. Hazard.
J. Sancho enters the game and replaces M. Reus.
The hosts also replace Reus with Jadon Sancho.
Dortmund make another change now as Hazard cedes his spot to Julian Brandt.
74'
To put it simply, a draw here is enough for Dortmund with results as they stand. But a win would guarantee them top spot - and a loss would leave them susceptible to Brugge in pursuit.
72'
Well, that goal has put the cat among the pigeons - or has it? Club Brugge are now 2-0 up against Zenit thanks to Hans Vanaken. A draw here for Dortmund though would still be enough as it stands, because Lazio and Brugge meet next week - and only one of them would be able to match or overhaul them as it stands.
70'
M. Lazzari enters the game and replaces M. Fares.
J. Akpa Akpro enters the game and replaces Lucas Leiva.
Andreas Pereira enters the game and replaces J. Correa.
The Serie A side also swap out Correa for Andreas Pereira to complete their changes.
The visitors also take off Fares for Manuel Lazzari.
Lazio make their first change now as Leiva is replaced by Jean-Daniel Akpa Akpro.
69'
Schulz looks to make immediate amends and just squeaks an effort across the face of the Lazio six-yard area now from the left edge, putting it out at the far post. Close but no banana.
67'
Penalty goal scored by C. Immobile for Lazio!
GOAL! CIRO IMMOBILE LEVELS FOR LAZIO! 1-1! As calm as you like, the striker steps up and sends Burki the wrong way, rolling his effort into the bottom-left corner. Game firmly back on.
66'
Penalty to Lazio! Schulz has barely been on the field and he gives away a spot-kick with a wafer-thin hack at Milinkovic-Savic, with the referee making little hesitation. Immobile to take.
64'
Morey spears a cross into the Dortmund box, which Hummels skims out for another corner. Lazio work it to maintain pressure on that final third, before a scrappy counter eases the hosts away.
62'
N. Schulz enters the game and replaces Raphaël Guerreiro.
Immobile! Now that is a strike from the Lazio forward - and a stop from Burki too, who tips the low half-volley around his left post. The corner is defused and Dortmund survive a scare.
Dortmund make a change now as goalscorer Guerreiro makes way for Nico Schulz in the first swap of the game.
58'
Reina seizes upon another Dortmund half-shot skewed across the face of his goal now too. There's been a few such deliveries verging on crosses today, or simply wild off-target efforts.
56'
Another Lazio corner, another lacking finish around the area. But the Serie A side are up for this; we're already seeing a more open game between both sides as it stands.
52'
The hosts are promptly forced back to the other end by a sharp Lazio break though, resulting in a corner. The set-piece is poorly received however and Dortmund get the goal-kick.
50'
Hazard tries to cut back in with a smart finish that skews wide, only seconds after Reyna forces a dive from Reina to beat away his low effort. Dortmund would love a second if they can.
48'
A quick reminder of how things stand; Dortmund will go through as Group F winners today if they remain in the lead here. Lazio will have to wait for next week, unless Club Brugge capitulate against Zenit.
46'
Lazio waste little time and crack a speculative effort over the bar within half-a-minute of the restart, They surely have to chase this one hard now.
We're back underway for the second half in Germany. Let's hope that late first-half strike is enough to serve up a more spirited second act here.
45'
HALF-TIME: BORUSSIA DORTMUND 1-0 LAZIO
44'
Raphaël Guerreiro has scored a goal for Borussia Dortmund! Assist by T. Hazard.
There's a host of lovely little bits where Dortmund read the situation there and it is Hazard who tips the final open pass in. Lazio fail to clear it and Guerreiro pounces. A gut-punch on the break.
GOAL! RAPHAEL GUERREIRO PUTS BORUSSIA DORTMUND IN FRONT! 1-0! Reina distributes a ball to midway and the hosts simply cut back through with a dizzying clutch of one-two plays, releasing the Portuguese into the box to bury a finish past the keeper.
42'
Neither side looks like they will unlock the other before the break here, but Dortmund do have more of a spring in their step. They appear to have resumed a skillful pressing game now.
40'
Compared to his opposite number, Inzaghi is merely bundled up in his dugout half the time as he looks to unlock Dortmund's gameplan. It's a nippy three degrees celsius out there today.
38'
An update from elsewhere in Group F; Club Brugge have the lead over Zenit thanks to teenager Charles De Ketelaere. As it stands, the Belgians would move up to seven points - just two behind Lazio and three behind Dortmund if the pair remain locked in a draw.
36'
We'd had two goals by this point in October's tie. This has been a more low-wattage affair, it would be fair to say.
33'
You could pick your foul there as Hazard and Reus are both downed two seconds apart in an attacking move. Dortmund have a free-kick, 35 or so yards out in the centre-left channel.
30'
That's the most egregious miss of the match so far, but even if Acerbi had found the net, it likely would have been chalked off; replays suggest he was offside.
27'
Hazard drafts a deflected cut-back straight over the bar, missing an unmarked Reus on the cusp of the box. A half-chance slips away for the hosts.
25'
It's just the two shots apiece so far, though Dortmund have enjoyed 61 per cent of the ball in total. Hard to say who might crack this one open first for certain though.
23'
This game is creating possessive opportunities at each end with regularity but they've got all the bite of a Wet Wet Wet ballad so far. Favre at least looks animated on the sidelines.
21'
Having kept their visitors on hot coals early on, Dortmund now feel as if they are on the back foot. Correa dinks into the box and slips in front of Burki as he tries to shoot under pressure
The hosts do reverse their standing and break back into Lazio's final third in short order though, though Reyna is unable to craft an effort to beat Reina.
19'
Dortmund have an appeal for a penalty after Bellingham is shunted off the ball. The England man was downed outside the box by Marusic but no foul was given either way.
17'
Acerbi catches Reyna with a trailing leg and concedes the foul. The latter is responsible for a lovely move a moment later, yet the end result is Hoedt steering the ball away from the box.
15'
You'd be hard-pressed to call this one blood-pumping so far. Immobile is now slipped into the Dortmund area and fails to launch a disciplined shot.
13'
Hazard spears a tumbling shot straight to Reina, but the keeper's shoddy distribution nearly undoes his stop. Morey hoists a follow-up well into the stands behind.
11'
Back down the other end, Delaney slots a narrow square ball into the six yard area from wide on the right flank. Hoedt parries and Dortmund retreat.
9'
Now this is much smarter play from Lazio, who break into the Dortmund half for the first real time in this match. A throughball to Immobile is intercepted however to foil the move.
7'
Better from the visitors, as they pick off some Dortmund passes, but the hosts reassert forward momentum in quick order before a threat can be spawned.
5'
Lazio have hardly had a sniff of possession outside their own half so far. The hosts are working the ball around, piecemeal as they look to pierce the box again.
3'
Reina snaffles the set-piece delivery and distributes back to midfield. Dortmund, in a sea of yellow shirts, impose themselves onto the ball smartly once more.
2'
The hosts waste absolutely no time in testing the Lazio defence, with a deflection in the box sending a Bellingham strike spiraling out for an early corner.
1'
We are underway in this Champions League encounter between Borussia Dortmund and Lazio!
Hello and welcome to live coverage of the 2020-21 UEFA Champions League as Borussia Dortmund and Lazio both look to book their places in the knockout stages - potentially at the expense of the other - in a Group F clash from Signal Iduna Park.
Both sides sit on the cusp of furthering their European ambitions - and while victory for one would assure them of a spot for the next stage, results elsewhere could mean that Lucien Favre and Simone Inzaghi both have reason to celebrate at the close of play.
To break it down, Dortmund sit top of Group F with nine points, while the unbeaten Lazio trail them on eight. That still leaves them four ahead of third-place Club Brugge however - meaning that providing the Serie A side better match the Belgian side's result, they are through - even if that result is a defeat.
That being said however, a win here would likely send the victor through to the knockout stages atop their quartet - and hand them a potentially more favourable draw for the new year. Both sides will be desperate to mix it with the upper echelon - but only one can do so.
Lucien Favre will be delighted with that ace up the sleeve. Simone Inzaghi? Less so. The Serie A outfit are still in this contest though, for certain.
The teams have emerged at Signal Iduna Park for the Champions League anthem.
Confirmation then that victory for Club Brugge elsewhere tonight sets up a thrilling encounter next week, as Lazio host the Belgian side in a winner-takes-all game for the other Group F spot. Dortmund meanwhile face Zenit, who will hope to end their European journey with a win to their name. Until then, thank you for joining us - and have a good week!
It is job mostly done for Lucien Favre then. Even with the blow of the news that Erling Haaland will be out for a few weeks at the very least, his side got the result they needed today. Simone Inzaghi knows that his side rallied well - but that their work remains incomplete.
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