FULL-TIME: The referee brings the game to a close and Dortmund have one foot in the final after an impressive 4-1 win over Real Madrid thanks to four goals from Robert Lewandowski.
Chance for Varane as the ball drops to him inside the box and his shot just flies wide of the target.
It has been coming and Sergio Ramos is booked for a clash with Kehl.
Gundogan is replaced by Schieber in Dortmund's final change.
There will be four minutes of added time at the end of the 90 minutes.
Sight of goal for Ronaldo, but Weidenfeller is quickly off his line to block his effort. Weidenfeller is down and in need of treatment after being caught by Ronaldo in the challenge.
Great tackle by Hummels to deny Ronaldo getting a shot in on goal.
Another change for the home side as Grosskreutz comes on for Piszczek.
Dortmund make a change as Blaszczykowski is replaced by Kehl.
Real make their final change of the game as Kaka comes on for Alonso.
Lewandowski is searching for his fifth of the night and he is denied by a fine save from Lopez as he tips his shot from the edge of the box over the crossbar.
Good goalkeeping from Weidenfeller as he rushes from his line to block an attempted cross from Khedira.
Chance for Dortmund as Blaszczykowski is fouled 25 yards from goal, but Gotze's free-kick is cleared by Khedira.
Lewandowski is booked for a block on Ramos. Been an eventful night for Lewandowski.
Double change from Real Madrid as Benzema and Di Maria come on for Higuain and Modric.
GOAL: Lewandowski makes no mistake from the spot as he fires his penalty straight down the middle. Four goals for the Pole what a feat.
PENALTY: Dortmund win a penalty as Alonso barges over Reus inside the box.
Ronaldo gets on the end of Modric's corner, but he fails to get his effort on target.
Ozil is booked for unsporting behaviour for calling for a yellow card for a Dortmund player.
Ramos is adjudged offside as he gets on the end of Alonso's free-kick.
What a run and shot from Gundogan as he beats three Real challenges before firing in a rising shot which Lopez does brilliantly to tip over the crossbar. Dortmund in the mood for more goals.
Lewandowski has been in sparking form tonight and there could be more goals for him yet.
Modric has a shot from the edge of the box, but it is a comfortable save for Weidenfeller.
Lewandowski shows a great touch inside the box before drilling his shot high into the net past Lopez to send the home fans into raptures.
GOAL: Dortmund go 3-1 up as Lewandowski fires home his hat-trick.
Khedira is the first player to be booked for a foul on Reus.
Blaszczykowski is played in by Lewandowski inside the box, but he fires well over the top.
Seen replays of the goal now and the officials got that one right as Pepe was playing Lewandowski onside as he latched onto Reus's pass.
Real defender appeal in vain for an offside flag against Lewandowski as he pokes the ball home from close-range and the goal is allowed to stand.
GOAL: Dortmund restore their lead with a controversial effort from Lewandowski.
Reus's delivery is straight into the arms of Lopez.
Dortmund win a corner as they look to get back on the front foot.
Ramos is fortunate to escape a booking after a high foot challenge on Reus.
RESTART: Dortmund get the second half underway and there are no changes from either side.
HALF-TIME:The referee brings the first half to a close and it is all-square at the break with Cristiano Ronaldo's goal cancelling out Lewandowski's early opener for the hosts.
There will be one minute of added time at the end of the first 45 minutes.
Dangerous cross from Ozil is just about cleared by Piszczek. Dortmund appear to have lost their focus since not getting that penalty decision earlier.
Ronaldo scores a simple tap-in after Higuain capitalises on a terrible mistake by Hummel and he unselfishly crosses for Ronaldo to slot the ball into the empty net.
GOAL: Real draw level through Ronaldo.
Dortmund have strong claims for a penalty waved away as Reus goes down in the box under pressure from Varane.
Great strike from the edge of the box from Alonso, but it is blocked by the Dortmund defence. The shot was travelling there.
Good build-up from Ozil and Coentrao down the left sees the full-back get to the byline, but his cross is poor and goes straight out of play.Wasted opportunity.
Gotze tries to catch Real by surprise from a quick throw-in, but the ball just runs out of play. Good thinking from the Dortmund man.
Higuain tries to pick out Ronaldo inside the box, but his cross is just too deep and runs out of play. Real getting a real foothold in the contest now.
Lewandowski goes down in the box, but Dortmund claims for a foul are waved away.
Opening for Blaszczykowski as he runs into the box, but Higuain is the man who gets back to stop the Dortmund winger getting his shot away.
Real starting to make some inroads in the final third as they win another free-kick for Subotic's foul on Coentrao. From the free-kick Weidenfeller punches away Alonso's delivery.
Ronaldo clashes with keeper Weidenfeller as he tries to get on the end of Alonso's deep free-kick, but both players are quickly back to their feet.
Good defending from Subotic as he rises highest to head away Alonso's free-kick towards Ronaldo. Play switches straight to the other end but Coentrao makes a vital interception to break up the attack.
Good block from Schmelzer to keep out Khedira's shot wide on the right.
Gundogan tries his luck from 30 yards out, but his effort is well wide of the target.
Great effort from Ronaldo, but Weidenfeller is behind the ball to push it away to safety. Real's first chance of the game.
Ronaldo dropping deeeper to try and get hold of the ball and now he has won a free-kick 35 yards from goal.
The game is starting to settle down now after Dortmund's flying start to the clash.
We have seen very little of Ronaldo so far and a cross from the right is too high and flies over the Portuguese star's head.
Good defending from Ramos to head away Gotze's cross from the right after another rapid counter attack from the home side.
Gundogan has picked up a knock after a clash with Khedira, but he is okay to continue.
15 minutes gone and Dortmund have settled straight into this contest and Jose Mourinho has been on the sidelines trying to get instructions out to his players.
Real have claims for a free-kick right on the edge of the box waved away after Modric goes down under pressure from Reus. Let off for Dortmund there as it looked a foul.
Real try to get Ronaldo into the game as Ozil tries to play him in on goal, but his pass is overhit and collected by Weidenfeller
Lewandowski gets on the end of a cross from Blaszczykowski, but he cannot get enough on it to direct it towards goal.
Ramos is called back for a foul on Lewandowski, but he escapes a booking.
What a start for Dortmund and they are pressing Real all over the pitch.
Lewandowski fires home from close-range as he meets Gotze's inviting cross from the left by getting ahead of Pepe to volley the ball home from inside the six-yard box.
GOAL - Dortmund make the breakthrough.
Great chance for Dortmund as Lopez produces a fine save to keep out Reus' effort and the ball drops to Lewandowski, but the ball runs away from the Polish striker and Ramos manages to get back to block his shot. Close run thing for Madrid there.
Good tackle from Reus to steal the ball from Modric just as he was about to pull the trigger on the edge of the box.
Both sides feeling each other out in the early stages as the Dortmund fans try to push their side on.
Confident start from Madrid as they try to string their passes together.
KICK-OFF: Real Madrid get the game underway.
Germany beat Spain last night will it be the same tonight?
The Champions League anthem is blurring out across the stadium now.
The two sides are out on the pitch as we approach kick-off.
It will be interesting see what kind of reaction Mario Gotze gets tonight from the home fans following news of his impending move to Bayern Munich.
The atmosphere is building inside the Westfalenstadion and lets hope the game lives up to the occasion.
Chris Green is hoping for a game as good as last night's Bayern Munich v Barcelona encounter and he tips Real Madrid to prevail 2-1.
Newcastle fan Pete Shields can only see a Real Madrid win tonight with Ronaldo scoring a couple of goals.
Timal Subasingha is going for a 3-1 win for Dortmund. What are your predictions?
Real are bidding to secure a first final appearance since 2002 as they go in search of a tenth European Cup crown.
Robert Lewandowski and Cristiano Ronaldo will pose a threat for both sides and are top scorers for their respective sides.
Who will be the key men for both sides tonight?
I am expecting goals tonight as remarkably Real have scored in each of their last 17 Champions League away games, but have also failed to keep a clean sheet away from home in Europe this season.
The Spanish giants have lost their last five away games in Germany and lost 2-1 to Dortmund in the group stages at the Westfalenstadion. Can Real win tonight?
Predictions for the game and are you happy with both side's team selections?
I look forward to hearing from you and I will endeavour to post as many of your thoughts, opinions and reaction as I can.
If you would like to get in contact at any point this afternoon then please don't hesitate. You can mail me via the Score Centre, email me direct on Peter.O'Rourke@bskyb.com and you can also now Tweet me: @skysportspeteo.
Real Madrid starting XI: Diego Lopez, Ramos, Varane, Pepe, Coentrao, Alonso, Khedira; Modric, Ozil, Ronaldo; Higuain
Borussia Dotmund XI: Weidenfeller; Piszczek, Subotic, Hummels, Schmelzer; Gundogan, Bender; Kuba, Gotze, Reus; Lewandowski
The teams are in...
Whilst we wait for the team news, why no visit our friends at SkyBet for a little flutter. Dortmund 13/8 Draw 5/2 Real Madrid 13/8
Hello and welcome to our minute-by-minute commentary of Borussia Dortmund's UEFA Champions League semi-final against Real Madrid.