Dion Dublin
Former Manchester United striker on BBC Radio 5 Live

You can't afford to take too many liberties when you're only one goal up.

United need to be careful.

Dean Henderson has hardly had anything to do in the opening 20 minutes or so but the United keeper quickly races off his line to make a crucial clearance to halt a rare Young Boys attack.

Simon Stone
BBC Sport at Old Trafford

Ralf Rangnick retreated to the Manchester United dug-out after that Mason Greenwood opener and had quite an animated discussion with coaches Darren Fletcher and Kieran McKenna.

Rangnick has confirmed former New York Red Bulls and Toronto coach Chris Armas will be joining his staff when he gets a work permit.

Amad Diallo is really putting himself about. He's an easy target for the visiting defence but the young Ivory Coast winger has just won his team another corner.

Ousmane Dembele blazes a big chance over for Barcelona. He plays it out right to Memphis Depay, who pulls it back for the Newcastle United target who hammers over with a first-time effort.

The other game in Manchester United's group between Atalanta and Villarreal has been postoned because of heavy snow.

The game is expected to be played tomorrow.

It's a big one, too, with the winner taking the second qualifying spot behind United.

Benfica have just taken the lead against Dynamo Kyiv thanks to Roman Yaremchuk's near-post finish.

As things stand, Barcelona are OUT.

Amad Diallo has just taken a whack and is down wincing in pain. The good news is he's going to be fine to continue.

Meanwhile, United are really pressing Young Boys.

Bayern's Alphonso Davies has Barcelona's defence on toast for pace and he's hacked down by Ronald Araujo near the byeline.

Araujo is booked, the second Barca player on a yellow card now.

Lille have taken the lead against Wolfsburg in Group G - where every team can still qualify for the last 16!

That means they go top and will stay there if Red Bull Salzburg don't win. They are currently drawing 0-0 with Sevilla.

Seville have to win and hope Lille lose, while Wolfsburg need to win and hope the other game finishes a draw.

Got it?

Corin Wright: More intensity in the first 15 minutes than in the last few years combined under Solskjaer

Mason Greenwood has scored his eighth goal in major European competition (excluding qualifiers) for Manchester United, the most of any player for the club before their 21st birthday, overtaking Marcus Rashford.

There's a real energy about this much-changed United team. That goal has given them a real spring in their step. Ralf Rangnick will like what he is seeing.

Robbie Savage is commenting for BT Sport. He's just said it's time for Ralf Rangnick to make changes. Savage's son, Charlie, is on United's bench.

Dion Dublin
Former Manchester United striker on BBC Radio 5 Live

That's a really good finish!

Nice patient play down the left-hand side and fantastic work from Luke Shaw.

It's a very hard finish but he made that look very easy!

The keeper had no chance.

Well would you believe it. It's chucking it down at Old Trafford. Young Boys have made a bright start and are managing the conditions well. They're spraying it around Old Trafford with confidence.

Image source, Getty Images

First chance for Barcelona now but Jordi Alba's 20-yard drive is held by Manuel Neuer.

No fans in Munich tonight because of, you know.