Faivre has a nervy moment as he drops a late cross from Wan-Bissaka, but the keeper manages to gather at the second attempt ahead of Elanga. The United full-back slams into the advertising hoardings after the delivery and receives treatment at the full-time whistle.
Maceiras drops his shoulder down the right flank and delivers a cross into the box that Heaton does well to claim at his near post.
BLOCK! Bailly throws himself in the way of a powerful low drive from Lefort from the left flank before Savage hacks away the danger.
There will be five minutes of added time.
C. Savage enters the game and replaces Mata.
Zidane Iqbal enters the game and replaces J. Lingard.
Savage also makes his debut for the Red Devils as he replaces Mata.
Iqbal makes his United bow as he replaces Lingard.
N. Maier enters the game and replaces M. Elia.
Maier enters the action to replace Elia for the closing stages of the game.
United have been fairly listless over the last 20 minutes. The game is there for the taking for Young Boys to attempt to push for a Europa League spot.
Lefort latches on to a loose ball on the edge of the United box. He angles a right-footed strike towards goal, but it drifts harmlessly over the bar.
S. Shoretire gets yellow.
Shoretire nudges Elia to the deck as the forward runs at the United defence. The substitute goes into the book.
S. Lauper enters the game and replaces M. Camara.
Lauper replaces Camara at the back for the visitors for the closing stages.
Maceiras raids down the right flank and digs out a cross into the middle. Bailly clears it as far as Martins, who lines up a strike on his left foot. However, the midfielder slices his effort well away from goal.
Wan-Bissaka is down on the field after taking a stray arm to the face. He requires treatment before the game can continue.
Mengi almost makes a crucial error at the back, slipping on the edge of the United box. However, he springs back to his feet to block a strike from Kanga.
T. Heaton enters the game and replaces D. Henderson.
S. Shoretire enters the game and replaces A. Diallo.
Rangnick makes the curious decision to withdraw Henderson. Heaton replaces the keeper, making his first United appearance at the age of 35.
Shoretire replaces Diallo in the final third for the home side.
Diallo makes a vital challenge at the back post to knock a cross from Ngameleu away from Lefort. The left-back looked to the referee for a penalty, but the United man got the ball.
W. Kanga enters the game and replaces J. Siebatcheu.
V. Sierro enters the game and replaces M. Aebischer.
S. Hefti enters the game and replaces F. Rieder.
Kanga enters the action to replace Siebatcheu as the Young Boys spearhead.
Aebischer is withdrawn for the visitors and is replaced by Sierro.
The goalscorer Rieder is replaced by Hefti in the middle of the park.
T. Mengi enters the game and replaces L. Shaw.
Mengi replaces Shaw at left-back for the home side.
Henderson does well to read a cross from Ngameleu from the right flank to gather it ahead of Siebatcheu lurking in the box.
United have made a bright start to the second half, but need to be more clinical in the final third to regain their advantage.
Greenwood bundles his way through the Young Boys defence on the edge of the box, but he drags a tame attempt on his left foot straight at Faivre.
United press once more through Elanga, but his throughball towards Lingard is diverted away from the midfielder by Maceiras. The hosts recycle possession, but Shaw's cross fails to find Diallo.
We're back under way at Old Trafford.
HALF-TIME: MANCHESTER UNITED 1-1 YOUNG BOYS
BLOCK! United are almost punished for a second mistake as Bailly is forced to deflect Aebischer's strike away from goal, Matic gives the ball to the Young Boys midfielder and he presses forward. Siebatcheu cannot force a strike goalwards and neither can Elia before Aebischer drills an attempt goalwards, only to be denied by Bailly in the six-yard box.
F. Rieder has scored a goal for Young Boys!
GOALLLLLLLLLLLLLLLLLLLLLLLLL!!!!!!!!! RIEDER SCORES A STUNNER!!!!!! 1-1!!!!!! Young Boys are back in the game courtesy of a fine strike from Rieder. Van de Beek gifts possession to the midfielder on the edge of the United box. Rieder gets the ball out of his feet before curling a right-footed attempt away from Henderson into the top-right corner.
OVER! Martins is afforded space in the final third and drills a left-footed effort at goal that is deflected over by Van de Beek.
Van de Beek lifts a fine cross-field pass for the run of Shaw down the left flank. The England international tries to force a cutback towards Elanga, but Rieder makes the interception.
Van de Beek and Ngamaleu collide in a 50/50 challenge for the ball, but the referee awards a free-kick to the visitors. The Dutchman is incredulous with the decision.
Greenwood makes a neat move in the final third and is brought down by a lunge from Lefort. United have a free-kick in a good position 25 yards from goal.
Elanga collects an offload from Shaw down the left flank and goes down under pressure from Maceiras. The referee is not convinced by his appeal for a free-kick and waves play on.
United take the free-kick quickly and win a corner down the right, only for Mata to clip his cross into the hands of Faivre.
Diallo tries to skip past the challenge of Lefort, but is brought down by the Young Boys full-back. United win a free-kick down the right flank.
Rangnick will be pleased with the way his side have started the game considering the 11 changes he made to his line-up. The youngsters have settled into the team and have a grip on proceedings.
Van de Beek strides forward to win the ball high up the pitch, but his second touch lets him down as he gifts possession back to Young Boys.
Lingard wins the ball in the Young Boys half, but he cannot bring it under complete control before he loses out to Martins.
Elanga catches Maceiras with a late challenge, but the referee points only for a free-kick to the visitors down the right flank.
M. Greenwood has scored a goal for Manchester United! Assist by L. Shaw.
Shaw surges down the left flank and supplies a perfect cross for Greenwood to convert.
WHAT A GOAL!!!!!! GREENWOOD VOLLEYS HOME!!!! 1-0 UNITED!!! The home side take the lead through a super strike from Greenwood on the volley. United build down the left flank before Shaw lifts a cross into the box. Greenwood finds space to take on the volley first-time on his left foot, finding the bottom-left corner with a crisp finish. A fine goal from the England international.
United are adopting a high press once more in a sign that they are adjusting to life under Rangnick.
Martins feeds the run of Siebatcheu in the United box. The USA international tries to find room for a strike on his left foot, but his weak attempt is charged down by Wan-Bissaka.
Mata scoops a ball over the top for the run of Diallo. Elanga takes the ball off the feet of his team-mate in the left-inside channel and sees his deflected strike travel into the hands of Faivre.
We're under way at Old Trafford.
Good evening and welcome to the live commentary of the Champions League Group F clash between Manchester United and Young Boys at Old Trafford.
Ralf Rangnick enjoyed a winning start to his tenure as interim manager of United, defeating Crystal Palace 1-0 in their Premier League clash at the weekend. Rangnick will be eager to maintain momentum to finish United's Champions League group campaign on a high note. The Red Devils' triumph over Villarreal secured safe passage into the last 16 of the Champions League, but Rangnick will want to confirm that they were the dominant team in the group by finishing top of the standings.
MANCHESTER UNITED (4-2-3-1): Dean Henderson; Aaron Wan-Bissaka, Nemanja Matic, Eric Bailly, Luke Shaw; Donny van de Beek, Juan Mata; Jesse Lingard, Amad Diallo, Anthony Elanga; Mason Greenwood.
Young Boys stunned United in the first match of the group stage and will have to repeat their heroics to keep their European hopes alive. The Swiss cannot qualify for the last-16 stage following their 3-3 draw against Atalanta last time out. However, they can reach the Europa League by placing in third in Group A by beating United and hoping that Villarreal defeat Atalanta. It is going to take a strong effort from David Wagner's men to hold up their end of the bargain.
MANCHESTER UNITED SUBS: Tom Heaton, Teden Mengi, Shola Shoretire, Matej Kovar, Bjorn Hardley, Charlie Savage, Zidane Iqbal.
YOUNG BOYS (4-2-3-1): Guillaume Faivre; Quentin Maceiras, Mohamed Ali Camara, Fabian Lustenberger, Jordan Lefort; Christopher Martins Pereira, Michel Aebischer; Meschak Elia, Fabian Rieder, Nicolas Moumi Ngamaleu; Jordan Siebatcheu.
YOUNG BOYS SUBS: Cedric Zesiger, Vincent Sierro, Wilfried Kanga, Miralem Sulejmani, Alexandre Jankewitz, Nicolas Burgy, Nico Maier, Yannick Toure, Sandro Lauper, Silvan Hefti, Leandro Zbinden, Abdullah Laidani.
Young Boys worked their way back into the game and could have been ahead before the break. The news that Atalanta and Villarreal will not play until tomorrow has given the Swiss outfit the chance to put the pressure on Atalanta in their bid to qualify for the Europa League. They still need a strong effort in the second half though to take all three points.
Manchester United are next in action on Saturday on the road against Norwich City in the Premier League. Young Boys face Sion in the Swiss Super League in their next match on Sunday.
Thanks for joining our commentary this evening. Until next time, goodbye.