On Tuesday, we will see if Liverpool can follow up their smash-and-grab 1-0 win over Paris Saint-Germain last week to progress to the last eight.
Harry Kane and Bayern Munich are also aiming to make it to the quarter-finals and have a 3-0 lead over Bayer Leverkusen.
Barcelona and Inter Milan are also in action this evening before we see Aston Villa, Arsenal and Real Madrid on Wednesday.
You can recap of all the action in our live blog below...
2 minutes agoBy Jack Cunningham
Liverpool 0-1 PSG (1-1)
Harvey Elliott is on for the second period of extra time.
Liverpool are attacking the Kop End, but what does either team have left in the tank?
They've both given everything in an intense high-quality match.
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10 minutes agoBy Jack Cunningham
Liverpool 0-1 PSG (1-1)
Couple more changes for both teams as Kang-in Lee replaces Khvicha Kvaratskhelia.
Liverpool introduce Cody Gakpo in place of Luis Diaz.
And the first half of extra time is nearly over, meaning we are edging closer and closer to a penalty shootout.
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15 minutes agoBy Jack Cunningham
Liverpool 0-1 PSG (1-1) - Chances
Ooohhhhhhh, so close for Paris Saint-Germain!
First, substitute Lucas Beraldo connects with a stunning cross from the left with a header.
It beats Alisson Becker and the far post.
Desire Doue then comes inches away from putting PSG into the lead with some brilliant feet in the box before bending a shot just past the far post.
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17 minutes agoBy Jack Cunningham
Champions League full times
So, as we head into the start of extra time at Anfield, let us have a look at what has been going on in the other games.
Bayern Munich and Inter Milan have sealed their places in the next round of the Champions League.
Harry Kane grabbed a goal and an assist on the night to seal a 2-0 win for the German giants, and they beat Bayer Leverkusen 5-0 on aggregate.
Kane also made history by becoming the first Englishman to score ten goals in a single European Cup or Champions League campaign.
In Italy, Inter Milan beat Feyenoord 2-1 at the San Siro to seal a 4-1 win.
Bayer Leverkusen 0-2 Bayern Munich (0-5)
Inter Milan 2-1 Feyenoord (4-1)
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23 minutes agoBy Jack Cunningham
Liverpool 0-1 PSG (1-1) - FULL TIME
These two can't be separated after 180 minutes of intense football.
It means we are going to extra time to settle this one.
There was only one goal on the night as Ousmane Dembele scored.
And ahead of extra time starting, Curtis Jones and Warren Zaire-Emery are on.
Jones replaces Alexis Mac Allister and Zaire-Emery is on for Fabian Ruiz.
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30 minutes agoBy Jack Cunningham
Liverpool 0-1 PSG (1-1)
The fourth official has indicated five minutes of stoppage time at the end of this one.
So unless there is a late winner, we will be going to extra time and potentially penalties.
Alexis Mac Allister goes into the book for a foul on Ousmane Dembele on the edge of the box.
That means he would miss the first leg of any potential quarter-final for the Reds.
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38 minutes agoBy Jack Cunningham
GOAL! Bayer Leverkusen 0-2 Bayern Munich (0-5) - Alphonso Davies
THIS HAS BEEN SOME DISPLAY!
Bayern Munich are destroying their Bundesliga rivals, and Alphonso Davies has got in on the act.
Joshua Kimmich slips a pass into Harry Kane in the area.
The England captain clips a pass to the back post for Davies, and he arrives to guide a volley into the back of the net.
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48 minutes agoBy Jack Cunningham
Liverpool 0-1 PSG (1-1)
This doesn't look good for Trent Alexander-Arnold.
The right-back attempts to make a tackle on the far side, and as he does, he rolls his ankle.
He is clearly in a lot of pain, and with a cup final on Sunday, Arne Slot takes no chances.
Jarrel Quansah comes on for him as Darwin Nunez replaces Diogo Jota.
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54 minutes agoBy Jack Cunningham
Liverpool 0-1 PSG (1-1)
Luis Enrique makes the first change of the game as he elects to introduce Desire Doue.
The 19-year-old comes on for Bradley Barcola.
Barcola was good in the first half, but he has noticeably faded in this second 45 minutes.
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59 minutes agoBy Jack Cunningham
Liverpool 0-1 PSG (1-1) - Chances
The second half has been much better from Liverpool, and they come close to getting back in front twice.
First, Dominik Szoboszlai sees a low shot brilliantly blocked by Pacho.
Then, Mohamed Salah gets on the end of a corner and pokes an effort towards goal, but there is Khvicha Kvaratskhelia to divert the effort over the crossbar.
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Today, 21:18By Jack Cunningham
NO GOAL! Liverpool 0-1 PSG (1-1)
Liverpool have the ball in the back of the net, but it's not going to count.
Diogo Jota plays Luis Diaz in down the left, and he's offside, but the play is allowed to continue.
The ball comes to Trent Alexander-Arnold, and he hits the post.
He then gets on the end of it again and squares for Dominik Szoboszlai who taps in, but it's ruled out.
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Today, 21:15By Jack Cunningham
GOAL! Bayer Leverkusen 0-1 Bayern Munich (0-4) - Harry Kane
TIE OVER!
Well, you were never going to keep him quiet!
Joshua Kimmich clips a free-kick into the box, and the home side just switch off.
Harry Kane controls it and finishes into the back of the net from close range.
That goal means he is the first Englishman to score ten goals in a single European Cup or Champions League campaign.
He is inevitable.
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Today, 21:04By Jack Cunningham
Liverpool 0-1 PSG (1-1) - Kick-off
Back underway for the second half at Anfield, and this tie is in the balance.
The prize for the winner is a place in the Champions League quarter-finals.
And immediately, Marquinhos is booked for stopping Luis Diaz.
That yellow means he would miss the first leg of any potential quarter-final for PSG.
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Today, 20:48By Jack Cunningham
Champions League half times
That is the end of the first 45 minutes in the three 8pm Champions League ties.
At Anfield, it is now 1-1 on aggregate between Liverpool and Paris Saint-Germain.
The Reds started the game well, but Ousmane Dembele scored from PSG's first attack, and they've dominated since.
Dembele could have had another while Bradley Barcola has also missed a good chance.
In Germany, Bayern Munich are drawing 0-0 with Bayer Leverkusen but have a 3-0 lead from the first leg.
Meanwhile, at the San Siro, Inter Milan and Feyenoord are playing out a 1-1 draw.
Marcus Thuram put the hosts in front before Jakub Moder equalised from the spot for Robin van Persie's side.
But Inter still lead on aggregate.
Bayer Leverkusen 0-0 Bayern Munich (0-3)
Inter Milan 1-1 Feyenoord (3-1)
Liverpool 0-1 Paris Saint-Germain (1-1)
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Today, 20:38By Jack Cunningham
Liverpool 0-1 PSG (1-1)
That could be a crucial block!
PSG break down the right through Bradley Barcloa, and he pokes a pass down the line for Ousmane Dembele.
He has Fabian Ruiz making a run towards the near post and Khvicha Kvaratskhelia lurking on the edge of the area.
The Frenchman picks out his fellow forward with a pass to him, and he connects with a first-time strike.
It appears to be whistling into the net, but Ryan Gravenberch just deflects it over the crossbar.
The corner comes to nothing.
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Today, 20:34By Jack Cunningham
Liverpool 0-1 PSG (1-1) - Chance
Ohhhhhhh, that is a massive chance!
Paris Saint-Germain brilliantly nick the ball back high up the field off Alexis Mac Allister.
Khvicha Kvaratskhelia immediately plays Ousmane Dembele in on goal.
The Frenchman's first touch is good but his second lets him down, allowing Alisson Becker to come out and smother.
But that was a huge opportunity for Dembele.
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Today, 20:28By Jack Cunningham
Liverpool 0-1 PSG (1-1)
Since the goal, Paris Saint-Germain have gained a measure of control of this game.
Ousmane Dembele is dropping very deep to get away from the centre-backs, which is leaving the Liverpool midfield outnumbered.
However, we are yet to see much of Khvicha Kvaratskhelia.
The Georgian star has been pretty quiet in the early exchanges.
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Today, 20:20By Jack Cunningham
Liverpool 0-1 PSG (1-1) - Chances
Big opportunities at either end!
Trent Alexander-Arnold loses possession. and a wonderful pass is slipped in behind for Bradley Barcola.
It looks for a moment as if he's gone around Alisson Becker, but the ball just gets stuck in his feet allowing the Brazilian to make the save.
Down the other end, Alexander-Arnold fizzes a corner into the box, and Diogo Jota is free.
However, he can't keep his header down, and it goes over the bar.
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Today, 20:16By Jack Cunningham
GOAL! Liverpool 0-1 PSG (1-1) - Ousmane Dembele
ALL LEVEL!
Liverpool have dominated the start of this game, but it is PSG who have opened the scoring!
Nuno Mendes plays a pass into Ousmane Dembele, who drops deep to receive the ball.
He slips a pass out wide to Bradley Barcola, who waits for Dembele to get into the area and rolls the ball in towards him.
Ibrahima Konate slides in, taking it past Alisson Becker, and there is the Frenchman to tap in.
He now has 21 goals in 16 - more than any other player in Europe's top leagues including Kylian Mbappe.
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Today, 20:11By Jack Cunningham
Bayer Leverkusen 0-0 Bayern Munich (0-3)
Harry Kane should probably have a penalty!
Bayern come down the right, and the ball is fizzed into the area.
Kane beats Jonathan Tah to it and looks certain to score, but the German international bundles him to the ground.
The referee and VAR say no, which is baffling because it looked to be a blatant spot kick.
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Today, 20:07By Jack Cunningham
Liverpool 0-0 PSG (1-0) - Chance
What.