Simon Stone
BBC Sport at Old Trafford

It is not a surprise Erik ten Hag made a change at half-time. If there was a shock, it was because he only took one player off.

There was no clear pattern to what Manchester United were trying to do.

At least Christian Eriksen should bring control to the midfield.

That's more encouraging.

Rasmus Hojlund spins his marker to get away down the left before whipping a cross between defenders and keeper. There's only Bruno Fernandes in the box, though, and he's nowhere near the ball.

Needed a centre forward in there. Unfortunately, he was the one sending in the cross.

There is a man on a loudhaler at Ramon Sanchez Pizjuan who is leading the chants of the home crowd, yelling so loud all you can hear is distortion. Only in Europe.

Ben White fires over from 25 yards, the first shot of the second half.

Paul Scholes suggested at the break on TNT that it might need a Copenhagen goal to spark this United team to life. Not sure there are many in the ground who would like to test that theory.

Goals have been at a premium in the 20.00 BST kick-offs...

Image source, BBC Sport

We go again.

Arsenal have something to build on but Manchester United are in dire need of some inspiration.

United have made a change - Christian Eriksen is on for Sofyan Amrabat.

Image source, Getty Images

A reminder that Sevilla are the top seeds in Group B. On paper, this is Arsenal's toughest match of the Champions League group stage.

It's an exam they are passing so far.

Conor McNamara
On BBC Radio 5 Live

Image source, Getty Images

It's a great time to score. There were four minutes added on for stoppages at the end of the first half and it's come right at the end of those four.

Martinelli has not seen much of the ball in the game but has had two of the biggest chances. The first of them came off the leg of the goalkeeper, then that one crucially has gone in.

Watching the replays of that Arsenal goal, it was criminal of me not to mention Gabriel Jesus first time round.

He collected a high clearance, brilliantly turned his man and set up Martinelli with the through ball which led to the goal.

A few seconds of pure quality have proved the difference so far.

Steve Bruce
Ex Manchester United defender on BBC Radio 5 Live

I think Manchester united will be bitterly disappointed, they have not moved the ball quick enough.

We have not seen Bruno Fernandes in the game who is arguably Man United's thread from the midfield to make things happen - they must up the tempo.

Dion Dublin
Former England striker on BBC Radio 5 Live

Very poor from Manchester United and very passive. They don't really want to put their bodies on the line, Copenhagen in my opinion are the better side and looking more capable of scoring.

Well, those half-time Seville oranges will taste a whole lot sweeter for Arsenal.

This is Gabriel Martinelli's Champions League debut tonight. He's been Arsenal's best player, and has marked his debut with a goal.

Image source, Getty Images

Not a half Manchester United will look back on fondly.

The whistle is met by boos.

Remember that Erik ten Hag's side really need to win this. You wouldn't know it.

Oh, Sergio Reguilon, you just needed to find the space in front of Marcus Rashford!

The England forward is in the clear but the left-back sends his pass behind him and Copenhagen can intercept.

Into four minutes of added time in Spain.

And Sevilla come the closest so far! Youssef En-Nesyri fires across the face of goal and has David Raya beaten, but the ball flies just wide of the left post.

Big let off for Arsenal.

All the threat is coming from Copenhagen.

United fail to clear and Diogo Goncalves is set up for a shot that deflects wide.