91Èȱ¬

Another change for AC Milan too as Pierre Kalulu replaces Davide Calabria.

The rain continues to pour over Old Trafford. Welcome to Manchester, Milan!

Rick: Hate to be a party pooper here for people saying how great United's youth system is but Diallo was signed from Atalanta.

A triple change for Manchester United as Fred, Brandon Williams and Luke Shaw come on for Bruno Fernandes, Aaron Wan-Bissaka and Daniel James.

Daniel James should do better as Mason Greenwood plays a great ball across the face of goal but James isn't able to turn home.

It is absolutely chucking it down now at Old Trafford.

Liam: Messi scored his first goal by lobbing the keeper with his left foot. Amad just did that with the back of his head

Cameron: I know all the talk will be about Amad Diallo and rightly so, but Manchester United have been awful tonight and Milan have been robbed.

Image source, Getty Images

Neil Lennon
Former Celtic manager on 91Èȱ¬ Radio 5 Live

This has been a good spell for Milan. They have had a lot more possession, created a couple of good chances and United have switched off again.

Manchester United are losing their way a bit again with AC Milan the better side in the last 10 minutes.

The visitors make a double change as Samu Castillejo and Sandro Tonali come on for Brahim Diaz and Alexis Saelemaekers.

AC Milan are readying a change as they look to try and find an equaliser. They've certainly had chances but have been let down by poor finishing. Sandro Tonali is the player preparing to come on.

Neil Lennon
Former Celtic manager on 91Èȱ¬ Radio 5 Live

AC Milan have had two great chances. They are just a little bit short in attack.

Rade Krunic should bury that header.

Bit of a moment for AC Milan now and they have a good chance to equalise but Rade Krunic puts his header over. Should have got that on target.

If you're wondering Wayne Rooney was 92 days older when he scored a hat-trick on his Manchester United debut against Fenerbahce in the Champions League (2004-05).

Amad Diallo (18y 243d) is the fourth youngest player to score for Manchester United in a major European competition, after Mason Greenwood, Marcus Rashford and George Best.

James: Superb finish. How on earth does Fernandes weight that ball so well when the pass is so straight?

Michael: Even United’s harshest critic must concede that their youth programme produces some outstanding players. In my 60 odd years it’s been: Forwards (plenty); Midfielders (lots); Goalkeepers (one); Centre Backs? still waiting. Certainly, the current team has plenty of room.

Just off the top of my head Michael....Wes Brown, John O'Shea, Jonny Evans & Axel Tuanzebe?

Manchester United put together a few passes around the edge of the AC Milan box before Aaron Wan-Bissaka's ball in is headed away.

The visitors then go up the pitch soon after and have a chance of their own but Rade Krunic fires wide.

Adam: Diallo!!!! What a finish.

Andrew: Diallo beginning to show why he's so highly rated. And for once, Ole doesn't waste time with his subs and what a move he made there. Fantastic.

Moulzee: Javier Hernandez-esque.

Bit of pressure from AC Milan as they start to recover from that shock opener.

Brahim Díaz embarks on one of his weaving runs into the box but his shot hits Harry Maguire before Dean Henderson saves a Franck Kessié effort at his near post.

Neil Lennon
Former Celtic manager on 91Èȱ¬ Radio 5 Live

All of a sudden Manchester United are in the ascendency.

Just watching United now they a re pressing much higher up the pitch and Milan can't get out. It is far better.

Amad Diallo's goal was his first for Manchester United, in his third appearance for the club and with his first ever shot for the Red Devils. Heck of an impact.

Meanwhile, Scott McTominay is booked for Manchester United for a foul on Gianluigi Donnarumma.

Neil Lennon
Former Celtic manager on 91Èȱ¬ Radio 5 Live

It was a magnificent chipped reverse pass from Bruno Fernandes.

I like the look of Diallo already. He has given Manchester United a real lift.

Manchester United have started this half like they did against Manchester City - much more purpose and intensity as Daniel James gets into the box but his effort is blocked.