Dortmund's front three or four are linking up every time now. one, two-touch stuff. Monaco can't get out. 

Image source, AFP

Nabil Dirar's first action is to be booked for shoving Shinji Kagawa. Harsh booking but another testing moment for the Monaco defence. Send the big men up..

Great ball in and well cleared!

Good free-kick whipped in by Dortmund but Joao Moutinho is able to scramble it clear. Christian Pulisic gets clear again on the right, he's been brilliant since coming on, and Monaco have to clear from inside their six-yard box. 

A shame to see Bernardo Silva coming off but he's been a passenger in the second half. A night for engineers, not artists for Monaco now.

Silva off, Nabil Dirar on. 

We expected goals Thomas, and we have them. Dortmund have had 71% of the ball since half time. Monaco can't get near it. 

Image source, Reuters

Thomas H: This is more like it from Dortmund. Direct attacking football. This game could turn into a goalfest over the 2 legs 

What a ball that is! Raphael Guerriero puts in a hell of a cross with the outside of his boot, Roberto Carlos-like, it flashes through the goalmouth and is crying out for a touch! 

It might be pouring in down in Germany but over in Spain Leicester fans are soaking up some sun.

Follow our live coverage of that game here.

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We've got a game on now. Every bit as exciting as we hoped as both teams pile men forwards. It's been all Dortmund since the break to be honest. They deserved that goal. 

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A much better 10 minutes for Borussia Dortmund. If they can end the night one goal behind they'll fancy their chances in the second leg won't they?

I say that, Thomas Tuchel is now going nuts in his technical area. 

Lovely touch from sub Christian Pulisic, who I've just found out played for Northants side Brackley Town as a kid, he breaks into the area and slides a pass across but there's nobody there.

Pulisic then skins his man again but Ousmane Dembele's shot is blocked. Great impact from the American. 

Image source, EPA

Monaco's Jemerson was shown a yellow card when giving away that free-kick a moment ago.

Dortmund win a corner now and Pierre-Emerick Aubameyang whips up the Yellow Wall who are in fine voice as ever. 

Image source, Reuters

Ousmane Dembele is probably the third or fourth best Dembele I've seen this season. We all dream of a team of Dembeles...

Dortmund starting brightly.

Close! Actually it's a way wide as Ousmane Dembele bends the free-kick over the wall and almost into the head of the official behind the goal.

Dortmund have kept with three at the back but put Raphael Guerreiro at left wing-back now. 

Image source, AFP

Straight from kick-off Dortmund almost slice through the middle but Pierre-Emerick Aubameyang is fouled on the edge of the area!  

Here we go then - the teams are out and Dortmund make a double sub.

Youngster Christian Pulisic and Nuri Sahin come on, Sven Bender and Marcel Schmelzer are off. 

Monaco have conceded 13 goals in the Champions League this season – including eight in their last two away games – more than any other team among the remaining quarter-finalists.

Monaco also missed a penalty in the first leg of their tie with Manchester City in the last round. They got away with it on that occasion - will they this time?