45 min: … Dortmund almost score! They take it short, Sancho chips to the far post, Zagadou rises highest and should plant a header home from close range. But the ball takes a slight deflection off Foyth, and Lloris is able to get over and palm away with a strong hand. Great save! Another corner follows, but that comes to nigh.
44 min: Goetze barges his way through a couple of challenges down the right and earns a corner. From which …
42 min: Hakimi goes on a power wander down the right. He looks for Goetze in the middle, but the ball takes a huge deflection off Vertonghen and loops into the arms of Lloris.
40 min: Sancho was livid at the lack of any decision from the referee there. You can not blame him. But it was a wonderful, exhilarating run by the English youngster, who was the star turn in this first half.
38 min: Sancho tears down the inside-right channel, gliding into the center. Sissoko, having been burned for speed, cynically clips Sancho's foot. It's a free kick to the right of the D, and a booking for Sissoko, but the referee waves play on. That's a very poor decision. Sissoko and Spurs have gone away with one there.
37 min: An odd cameo from Burki, who has the ball at his feet, lets him clank between his legs, spins through 360 degrees in confusion, then rediscovers his poise well enough to scoop a pass over Moura towards Toprak in the left-back position. From the ridiculous to the sublime.
36 min: Eriksen finds Son free in the left. He enters the box and hits a hard cross-cum-shot towards Moura in the middle. Burki, at the near post, kicks off from danger.
35 min: Delaney has a crack from a position to the left of D. It's heading to the bottom left. Lloris gets down well, though he can only parry straight back into the box. Sanchez can not quite clear; Sancho can not quite shoot. Spurs eventually clear their lines.
34 min: This is a bit better from Spurs, as Moura's almost fashions space for a shot 25 yards out. Then Vertonghen whips and cross in from left; Zagadou clears. Finally Aurier and Foyth combine crisply on the right touchline; Foyth cuts one back for Eriksen, who blazes a wild first-time effort over the bar from the edge of the box.
32 min: Son tries to trick Zagadou down the right with a elaborate dummy. It almost disappears but he runs out of pitch. Still nothing quite working for the hosts.
30 min: But then they are not getting any help from the referee either. Hakimi stands on Vertonghen's toe, near the left corner flag, but Spurs is not awarded a free kick in a dangerous position. Instead, Dortmund almost opened them from the resulting goal kick, Gotze close to setting Sancho off on another of his searing scampers on the right. Not quite.
29 min: Alderweireld creams and long passes down the inside-left, hoping to release Son. But Toprak calmly flicks and head back to Burki and that's that deal. Spurs does not click in the final third right now.
27 min: A much-needed period of sterile domination for Spurs. They're going nowhere, but they've pushed Dortmund back after a period in which the visitors were beginning to ask some awkward questions.
25 min: Not much happening for Spurs right now. Moura drops deep in the hope of making something happen, but his play is nervous and fidgety and he gives up possession with some loose control and a poor ball forward.
23 min: Sancho runs at Spurs down the inside-right again, and in tandem with Gotze causes all kinds of bother in the box. Fortunately for Spurs, they are able to crowd the pair out in numbers, and eventually shot squirts softly through the thicket and into the arms of Lloris. Dortmund is beginning to look extremely dangerous.
21 min: Sancho is scampering clear down the right wing, thanks to a first-time pass from Dahoud. For a second it looks as though he will make it into the box for a shot, turning Sanchez this way and that. But he decides to cross, and his low ball, intended for Gotze, is cut out well by Foyth.
20 min: Vertonghen clears Pulisic's free kick with ease, but Witsel immediately comes back at Spurs and sends a low fizzer to the bottom left. Lloris is behind it all the way and gathers confidently.
19 min: Sissoko slides in clumsily on Hakimi as the right-back races down the wing. This is a free kick just to the right of the Spurs box, which is now loaded with Dortmund players.
18 min: The visitors enjoy another period of sterile domination. This match has a nice back-and-forth swing so far, with both teams enjoying periods of possession. Nice.
16 min: Dortmund has snake and sniff now, and it's suddenly enlivened them. Gotze slips and passes the inside-right channel that should release Sancho, but the young striker takes a heavy touch that allows Vertonghen to come across and clear. He should have made it to the area for a shot on goal.
15 min: Foyth over-elaborates on the left-hand edge of his own box. Gotze strikes him out of possession and sets up Pulisic for a dribbling into the area. He's faced with a tight angle and has Sancho in the middle, waiting to tap home. But he tries to beat Lloris, who is not getting beaten at his near post and kicks away.
14 min: Passes are not sticking right now. Sanchez plays a poor one forward, Sancho intercepts, looks for Goetze, falls over.
12 min: Good work by Aurier, who chases an Eriksen passes the right and earns Spurs the first corner of the match. Eriksen takes. Foyth fresh-air kicks, and Dortmund can break upfield. Pulisic turns on the jets down the left and Aurier pulls him back from the elastic of his trousers. That's another first for Aurier: the first yellow of the game.
10 min: And it's giving Dortmund something to think about. Winks bursts into space in the middle of the park, and should release Son down the inside-right channel, but overhits the pass. Not by much; small margins.
9 min: After a slow-ish start, Spurs has started to get more into the game. They enjoy a long period of possession for the first time this evening.
7 min: Spurs takes the lead in spectacular style! Delaney's header upfield is not all that. Sanchez returns it, and the ball drops to Moura just inside the box on the left. Moura takes the ball down with one touch, then creams and diagonal volley inches wide of the top right! So closde. Burki was not getting to that.
6 min: Delaney slips and clever ball down the inside-left channel, into acres, but Pulisic was a bit slow to read it. Foyth plays it back to Lloris, who gives Spurs fans a shudder, almost getting shut down by Sancho. But he gets it away.
4 min: Dortmund enjoys the lion's share of possession in these early exchanges, but almost all of it is in their half. Gotze and Pulisic try to get a positive down on the left, but Foyth is in charge of this situation and clears.
2 min: Dortmund spend some more time knocking the ball around at the back. Then Delaney scoops and passes forward on the left for Sancho, who shortly threatens to drop his shoulder and scoot past Foyth, but Spurs hold their shape well and eventually the ball's won back. Early signs that Dortmund are not planning to sit back all evening.
And we're off! Wembley erupts again in the noise. Roars pinging off the walls. Dortmund stroke it around the back awhile, then give the ball to Winks, who combines with Vertonghen to send the ball out for a throw. Everyone just happy to get their first touch.
A minute's silence before kick-off. It's in tribute to England's 1966 World Cup goalkeeping hero Gordon Banks, who passed away yesterday, and the tragic Emiliano Sala. It's perfectly observed, then it segues into a warm applause. A touching moment. RIP.
The teams are out! A wonderful European atmosphere at Wembley, not least because the Dortmund fans have been in situ for ages and have been giving it snots. Tottenham Hotspur sports their world-famous lilywhite shirts, while Dortmund has their equally storied yellow and black. It's an aesthetic treat, my old association-football-loving pals. We'll be off in a couple of minutes!
A relaxed Mauricio Pochettino speaks to BT Sport! "I'm always positive. Of course we have the utmost respect for our opponent, Borussia Dortmund is a fantastic team and will be very competitive. But I believe in my players. It will be different, we can not compare to the last season, the momentum, the circumstance, the situation is different. We believe we should be at our best if we want to win. The competitive level is so high, with the Premier League it is the best competition, and we need to be 100 percent focused. We have tried to provide the team with fresh legs. I trust and believe in all the players and I'm right in my selection. People can talk after, but we always try to be right and prepare so we can win today. "
A reminder that VAR is in use for the first time in the Champions League this week. All the officials have been issued with a nicely typed leaflet explaining how the VAR team will "constantly check for clear and obvious errors related to the following four match-changing situations: goals, red cards, and mistaken identity. "Two matches in, and there's no major controversy that would lead you to question whether the whole thing is worth the effort yet. But give it time. Older readers may recall Andy Townsend's Tactics Truck, from 2001 ITV light-entertainment vehicle The Premiership. The set-up is not a million miles away. Tragedy + time = comedy.
Pennant watch: Tottenham's crest is a classic-style classic design, but it can not be said of this pennant. Some major issues with the text squeezed in the top, it's all over the place. Note that while the commemorative flag hangs from a solid silver hook, keeper and captain Hugo Lloris's shirt is on something of a shoogly peg. A cheap and cheerful metaphor for his recent form.
Both sides make four changes from their weekend XIs. Of the team named for the 3-1 win over Leicester City, Tottenham drop Kieran Tripper, Danny Rose, Oliver Skipp and Fernando Llorente to the bench. Their seats are taken by Serge Aurier, Toby Alderweireld, Juan Foyth and Lucas Moura. Jan Vertonghen will play left wing-back as Spurs start with a back three.
Dortmund drop Raphael Guerreiro, Maximilian Philipp, Lucasz Piszczek and Julian Weigl from the team that capitulated against Hoffenheim. Thomas Delaney, Omer Toprak, Dan Axel Zagadou and Chelsea-bound Christian Pulisic take their places.
Tottenham Hotspur: Lloris, Aurier, Sanchez, Foyth, Alderweireld, Vertonghen, Sissoko, Winks, Eriksen, Son, Lucas Moura.
Subs: Gazzaniga, Trippier, Rose, Lamela, Wanyama, Llorente, Skipp.
Borussia Dortmund: Burki, Hakimi, Zagadou, Toprak, Diallo, Witsel, Delaney, Sancho, Dahoud, Pulisic, Gotze.
Subs: Hitz, Guerreiro, Balerdi, Philipp, Wolf, Schmelzer, Bruun Larsen.
Referee: Antonio Jesus Lopez Nieto (Spain).
Hello, and welcome to the Jazz Club
According to their sports director Michael Zorc, Borussia Dortmund has eschewed former heavyweight metal coach Jurgen Klopp in favor of a "modern jazz approach" built around bandleader Lucien Favre's inventive new 4-2-3-1 arrangement. Nice! On the Wings, Jadon Sancho and Jacob Bruun Larsen. Playing full back, Achraf Hakimi. Axel Witsel and Mario Gotze in the midfield. Theydon Bois on guitar. Clam on bass.
The North Rhine-Westphalia Big Band are surely locked into a groove this season. They are leading the Bundesliga, top scorers with 54 goals, currently on their first title since 2012. They have only conceded two goals en route to winning Group A, keeping five clean sheets in six games. There's a good vibe about the place. Really nice.
But they have lost a little rhythm of late. A couple of weekends ago, and 3-3 draw at home to Werder Bremen in the cup led to defeat on penalties. Then last weekend they let a three-goal lead slip in the last 15 minutes at home to Hoffenheim in the league, allowing Bayern Munich to close the gap to the top to five points. They're not exactly nodding out on stage, but it's still a worry.
Tottenham's season meanwhile has been driven by some extremely experimental polyrhythms. They were forced to stage a great escape to get out of the groups after a dismal start; they were recently knocked out of both domestic cups in a grisly four-day stretch; and they are in the thick of the race for the Premier League, with Harry Kane and Dele Alli soon to return rested and fresh. Great!
So this is a close one to call. Form's no guide. Neither is the recent head-to-head, with Dortmund knocking Spurs out of the Europa League 5-1 on aggregate in 2016, and Spurs winning home and away in the Champions League last season. This tie is perfectly pitched. It's on!
The session begins at: 8pm GMT.