RB Leipzig subs: Tschauner (GK), Martinez (GK), Orban, Sabitzer. Hwang, Adams, Sørloth, Samardžić, Kluivert, Borkowski, Martel, Wosz.
RB Leipzig starting XI: Gulacsi. Angelino, Upamecano, Konaté, Forsberg, Nkunku, Kampl, Halstenberg, Olmo, Henrichs, Y. Poulsen.
Fact: RB Leipzig have won both of their matches versus English teams in European competition without conceding a goal – beating Spurs 4-0 on aggregate in last season’s UEFA Champions League last 16.
Fact: Manchester United are unbeaten in their last 10 home matches against German sides in European competition (W7 D3), with their last such defeat coming at the hands of Bayern Munich in April 2001 (0-1).
Fact: Manchester United and RB Leipzig will meet for the first time in European competition, whilst the Red Devils have won just one of their last four matches against German opposition in Europe (D1 L2).
Man Utd bench: Henderson, Fosu-Mensah, Mengi, Tuanzebe, Williams, Fernandes, James, Mata, McTominay, Cavani, Ighalo, Rashford.
Man Utd starting XI: De Gea, Wan-Bissaka, Lindelof, Maguire, Shaw, Matic, Pogba, Fred, Van de Beek, Greenwood, Martial.
Hello and welcome to tonight's UEFA Champions League match betwen Manchester United and RB Leipzig. Kickoff is at 8pm at Old Trafford.
We are underway at Old Trafford!
We've had a lively start here which Leipzig pressing well in their 3-5-2 shape against Man Utd's midfield diamond shape.
Kampl fouls Pogba from behind and hands United a good chance to deliver a freekick. Shaw puts the ball in and when it's clear, Fred draws a superb save out of Gulacsi from 20 yards.
Shaw delivers a corner for Man Utd and after some pin-ball in the box, he smashes a shot at goal which Poulsen does well to block with his head.
Pogba tries a big switch of play out to Wan-Bissaka on the right but it's overhit and goes out for a throw-in.
Martial does well to force Upamecano into a cheap giveaway and then runs onto Fred's pass but the Frenchman narrowly fails to pick out Greenwood inside the box.
Henrichs does some brilliant work down the Leipzig right as his backheel sends Olmo into space and he finds Forsberg to strike but Lindelof blocks the effort well.
Leipzig are pressing Pogba hard in this game but he has so far done brilliantly to shield the ball and move it forward.
Shaw releases Greenwood down the left flank but Forsberg covers well and draws a foul off the Man Utd youngster.
It's been a very cagey, close game so far with Leipzig slightly edging it on possession thus far but United have had 3 shots to 1 for the visitors.
GOAL! United take the lead! Pogba puts his foot on the gas, burst through midfield and sends Greenwood through to finish superbly. He looked offside but VAR rules that the goal stands.
Save! Nkunku is released in the inside right channel by Forsberg and draws a good stop out of De Gea.
Upamecano does well to get up to attack the corner for Leipzig but Matic picks up the second ball well and carries it to safety.
We have reached the half hour mark here and Leipzig have had 54% possession and more shots than the hosts but they trail 1-0.
Henrichs delivers a deep cross for the visitors and Angelino has a volley towards goal but Wan-Bissaka blocks well and De Gea claims the looping ball.
Matic goes into the book for United as he catches Forsberg with a high arm as he tries to shield the ball.
Stat: Greenwood becomes the youngest Englishman to score on his first Champions League start since Alex Oxlade-Chamberlain back in 2011.
Nkunku tries a dribble but Shaw stands firm. The left back is seemingly lifting his game with the added pressure of Telles pushing him for his spot.
Henrichs finds Olmo on the edge of the box and he fires off a shot which Maguire does well to block.
Since the goal, United have struggled to relieve the pressure against Nagelsmann's team, who are defending aggressively and high up the pitch.
Van de Beek does well in a tight space to find Fred but the Brazilian gives the ball away.
Martial wins a freekick to relieve pressure but when Shaw delivers, Lindelof fouls Poulsen inside the box.
Angelino receives on the left and takes on Wan-Bissaka in a 1v1 dribble but the defender is perfect with his sliding tackle for Man Utd.
The half time whistle blows and it's 1-0 to Man Utd thanks to Greenwood's fine finish in the 21st minute. Leipzig have played well though and don't deserve to be behind.
The fourth official indicates one minute of additional time to be played.
Nkunku takes an inventive corner for Leipzig and it reaches Angelino on the edge of the box but when everyone expects him to shoot, he tries a chipped cross instead and no one was anticipating it.
Pogba turns on the pace again and is hauled back by Henrichs, who gets yellow carded for RB Leipzig.
Only Brian Kidd and Wayne Rooney have scored a top-level European goal for Man United at a younger age than Mason Greenwood's 19 years and 27 days. Impressive.
The second half is underway as Man Utd kick us off.
Leipzig switch play well as Nkunku finds a pass wide to Henrichs. Shaw's quick to close down and clear the danger though.
CHANCE! Pogba slips in Martial who tries a cutback but Konate slides in to intercept and clear despite an accidental handball in performing the action. No penalty though. Greenwood has a shot which Gulacsi parries well to safety.
Nkunku gets a cross into the area and Maguire struggles to clear his lines but Matic completes the job.
Leipzig are stepping up the pressure as Nkunku's freekick bounces around the United box and Matic has to clear at the back post. Is an equaliser coming?
Angelino puts a ball into the box but Martial heads clear and then Pogba draws a foul to relieve the pressure. Leipzig are chasing hard here but not really creating clear chances.
Martial has two dangerous runs down the left in quick succession but Konate twice defends strongly to retrieve the situation.
Leipzig make a change too as Benjamin Henrichs comes off and Marcel Sabitzer comes into the fray.
Man Utd make a double change as Rashford and McTominay comes on for Matic and Greenwood.
RB Leipzig makes their second alteration as Nkunku comes off and Sorloth comes onto the field.
Save! Leipzig comes close as Poulsen wins a header and Konate has a close range change with his head which De Gea tips over the bar with great reflexes.
Sorloth gets a shot away without much backlift for the away side and Maguire makes a strong block.
Bruno Fernandes comes on to replace Van de Beek for Man Utd.
United have a freekick and when everyone expects Fernandes to shoot, he instead dinks a pass over the wall and Martial nearly gets onto it. Very clever routine that by Solskjaer's men.
With 20 minutes to go, United still lead 1-0 despite the away side having 56% of the ball in the game.
GOAL! Rashford runs onto a through ball by Fernandes and finishes excellently but the offside flag was raised. VAR checks and rules the striker was onside as he was inside his own half. Excellent goal. Man Utd 2-0 Leipzig.
Leipzig had made a change between those two goals as Kluivert came on to replace Kampl.
GOAL! Rashford again! Sabitzer is caught on the ball by Fred and Rashford picks up the ball, roasts past Upamecano and fires across the goalkeeper to seal the win.
United made a double change as Tuanzebe comes on for Wan-Bissaka and Cavani replaces Pogba.
Rashford nearly gets his hattrick as he cuts inside from the right, beats 3 players and has a shot blocked by Upamecano. He's been sensational since coming into the action.
Penalty! United have a deadly transition as Fred finds Martial in the box and Sabitzer takes him down.
GOAL! Martial gets to take the penalty and fires into the bottom corner past Gulacsi. That's 4-0 to United who have killed Leipzig since they introduced some of their big guns from the bench.
After giving away that penalty, Sabitzer was yellow carded.
Offside! Cavani is slipped through by Fernandes but he was well offside after making his run too early.
The referee ends the match as Utd win 5-0 after four goals in the final 14 minutes after an even game up to that point. Greenwood opened the scoring then Rashford got 3 and Martial netted a penalty.
HATTRICK! Rashford! The substitute has his third goal in just half an hour on the pitch as he receives from Martial and rifles a shot into the bottom corner. Man Utd 5-0 RB Leipzig.
The fourth official indicates four additional minutes to be played.