Old Trafford is a greasy surface as the rain continues to pour and Dean Henderson does well to stop Christopher Martins' attempt.

Kingsley Coman runs at Gerard Pique - no contest there - and finds Thomas Muller, whose low shot is saved.

It's a long way back from here for Barca. In many different ways.

Thomas Muller is the eighth player to reach 50 Champions League goals, and the first German.

• 140 – Cristiano Ronaldo
• 125 – Lionel Messi
• 82 – Robert Lewandowski
• 76 – Karim Benzema
• 71 – Raul
• 56 – Ruud van Nistelrooy
• 50 – Thierry Henry
• 50 – Thomas Muller

Dion Dublin
Former Manchester United striker on BBC Radio 5 Live

It's a good save, a really good save.

He's about twelve yards out on his good foot ... that should be a goal.

He's a world class player, I love the way he sees things and makes things happen but he should have scored that.

United need to be more ruthless.

A wonderful run by Mason Greenwood who goes past his marker as though he is not there and then lays it off for Juan Mata.

His attempt takes two deflections and flies behind.

United are good to watch when they play like that.

Simon Stone
BBC Sport at Old Trafford

Manchester United keeper Dean Henderson is keeping himself busy with a couple of darts from his box to clear and a decent save as well.

It is an important few weeks for the England keeper.

He wants to play but never got the opportunity under Ole Gunnar Solskjaer this season.

He hasn't given up forcing his way into Ralf Rangnick's plans but if he doesn't, he is likely to seek a loan move in January.

The Swiss champions are growing into this. Here's Fabian Rieder inside the box but it's straight at the keeper. Needed a bit more composure.

Kingsley Coman whips in a cross and Jamal Musiala's header is deflected off Gerard Pique and into the gloves of Marc-Andre ter Stegen.

Bayern on top. Barcelona need to win.

A crunching challenge between Donny van de Beek and Nicolas Moumi Ngamaleu and the Young Boys player comes off the worse.

It's a honest challenge by Van de Beek.

Moments earlier, Michel Aebischer tested Dean Henderson with a curling attempt.

Image source, Getty Images

Jordi Alba did his hamstring a minute ago while clearing the ball after Robert Lewandowski failed to make proper .

Oscar Mingueza replaces him.

That means Barcelona basically have four centre-backs on the pitch now, one on each side of a back four.

JT in Rhyl: Mata showing us what a brilliant player he still is. Juan of the best

Roger: I'm gonna say it. Mason Greenwood is right now the best finisher in the EPL, let alone the CL

Mason Greenwood has the most goals in all competitions of any Premier League player aged under 21 since start of the 2019-20 season (34).

Image source, Getty Images

Huge chance for Bayern. Thomas Muller runs down the left and his shot from a tight angle is tipped away by Marc-Andre ter Stegen. The loose ball just runs behind Robert Lewandowski, who would have had a tap-in.

Dion Dublin
Former Manchester United striker on BBC Radio 5 Live

United do appear to have control of the game but that is all down to their midfield.

I like the way they're moving the ball from the left to the right fast. It's making Young Boys adjust their positions.

United win a free-kick about 25 yards out. Juan Mata is standing over it and he gets it over the wall - but also over the bar.

It's a tidy performance so far by Ralf Rangnick's side. Luke Shaw is trying to find space out wide. He played a key role in the goal with a super deliver for Mason Greenwood.

I've just seen a replay of Greenwood's finish. Lovely technique.

Barcelona can probably stop hoping for a Dynamo Kyiv favour.

Benfica lead 2-0 thanks to Gilberto's strike, meaning Barca have to beat Bayern Munich tonight.

The Portuguese side will finish second as things stand.