What is it?
When is it?
Wednesday April 19. Tonight!
What time is kick-off?
19.45 BST, as per.
What TV channel is it on?
BT Sport 3 and BT Sport 3 HD. Alternatively, we will be bringing you live coverage of the match right here.
What is the team news?
Benjamin Mendy returns from injury and should slot into the side in place of Andrea Raggi at right back after the Italian's defensive frailties were exposed in the second half in Dortmund.
But the French side will miss the ballast that defensive midfielder Fabinho provides in front of the back four; the Brazilian is suspended after picking up a booking in the first leg.
Possible line up: (4-4-2) Subašić; Touré, Glik, Jemerson, Mendy; Bernardo Silva, Bakayoko, Moutinho, Lemar; Falcao, Mbappé
Misses next match if booked: Jemerson, Falcao, Germain, Lemar, Sidibé
The visitors have Marco Reus back from a six-week lay off with a hamstring injury, the forward scored Dortmund's first goal to set them on course for a 3-1 victory over Frankfurt on the weekend.
Defender Marc Bartra is expected to be out for around a month having fractured his wrist when the team bus was attacked prior to the rescheduled tie last week.
Mario Gotze (illness) and Andre Schurrle (achilles) remain sidelined.
Possible line up: (4-1-4-1) Bürki; Piszczek, Papastathopoulos, Bender, Schmelzer; Weigl; Dembélé, Castro, Reus, Guerreiro; Aubameyang.
Misses next match if booked: Ginter, Guerreiro, Papastathopoulos, Schmelzer
What are they saying?
Our team are used to playing a certain way and we won't change our DNA. Maybe we'll need to score to go through. We expect Dortmund to be much stronger than in the first leg. They have Castro and Reus back and they're two very important players for them.
Our minds have to stay on tomorrow's game. We're 90 minutes away from reaching the semis but our opponents are in the same situation. We need to approach this as we have all our Champions League matches this season.
We need to play well and I'm convinced we can do it. I have brought a quality squad here and we're capable of winning by two clear goals. We must find the balance between defence and attack.
We are an attacking side and we'll try to create as many chances as possible. Our trademark is scoring goals. What we must avoid is losing the ball as easily as we did for Monaco's third goal in the first leg. We will attack from the first minute until the 90th.
What are the odds?
Monaco win: 21/10
Monaco to qualify: 4/11
Dortmund win: 11/10
Dortmund to qualify: 5/2
What's our prediction?
More goals. Four of them. And an even split at that. 2-2.