Trent Alexander-Arnold's ball from the into the box from a corner is a beauty and Kylian Mbappe has a go on the volley but his effort is straight at Manuel Neuer.

Bayern go up the other end but there's no one up with Michael Olise and the attack breaks down.

Kai Havertz, whose stoppage-time goal in Lisbon gave Arsenal a first leg lead, is on for Viktor Gyokeres who hasn't really impressed against his former club.

Ally McCoist
Former Rangers striker on TNT Sports

Madueke is running away from goal. It has to be left for Martinelli who is ready to shoot at the goal.

Chris Sutton
Former striker on BBC Radio 5 Live at Emirates Stadium

Martinelli gets in Noni Madueke's way at the crucial moment.

Madueke tried to beat Rui Silva at his near post, but it was into the side netting. Big chance missed from Arsenal.

Arsenal have gone up a level in terms of their intensity.

Harry Kane (and Vincent Kompany) can not believe it as Eder Militao wins a free-kick for what looked like something and nothing.

He seems to be suggesting he was elbowed in the face. I didn't see an elbow. But the free-kick goes in Real's favour.

Ally McCoist
Former Rangers striker on TNT Sports

I wonder if Martinelli could've kept it down. You've got to keep it down. You need to go over it.

A volley by Gabriel Martinelli flies over the bar and then Noni Madueke fires into the side-netting. The volume is back up inside the Emirates.

Image source, Reuters

Steven Gerrard
Former England and Liverpool captain on TNT Sports

Fede Valverde is doing a really good job of getting over and helping Ferland Mendy stop Michael Olise on the right hand side.

Alex Howell
BBC Sport Arsenal reporter at Emirates Stadium

It looks like we will be seeing Kai Havertz soon. The forward has been getting detailed instructions from the bench before coming on.

This game is crying out for some excitement and flair.

Max Dowman has been told to warm up while it looks like Kai Havertz might be about to come on.

Five minutes have gone by without a goal. How boring.

Chris Sutton
Former striker on BBC Radio 5 Live at Emirates Stadium

No real flow to Arsenal's game and I think that is the issue. It hasn't quite happened with Arsenal.

Image source, EPA

A Sporting goal will make things very, very, interesting.

However...for all their hard work the Portuguese champions are yet to force David Raya into a save.

John Murray
BBC football correspondent on BBC Radio 5 Live at Emirates Stadium

The home supporters are desperate for this opening goal. They are trying to urge Arsenal on to that little moment.

Arsenal's fans turn up the volume after the home side win a corner but Declan Rice's set-piece falls into the hands of goalkeeper Rui Silva.

Still just the one attempt on target by the Gunners.

Steve McManaman
Former Real Madrid winger on TNT Sports

Vincent Kompany had to change something, but he's put on an even more attacking full-back in Alphonso Davies if anything.

Nedum Onuoha
Former Manchester City defender on MOTD: Uefa Champions League

There have been times where Arsenal have looked good when they've been able to inject speed into their play. But in terms of them playing out from the back and finding a way through Sporting when Sporting have been back in their defensive shape, then it hasn't happened yet.,

At the other end, Sporting have had one or two moments, not hugely significant ones but they have offered at threat in behind. Hitting the post before half-time will have reminded Arsenal that they still pose a threat going the other way, and they already have shown early in the second half that that they can be dangerous.

You can hear more from Onuoha on MOTD: Uefa Champions League at 22:40 BST on BBC One and the BBC Sport website and app.

Image source, Getty Images

Luis Diaz thinks he's squeezed the ball into the bottom corner but it takes a deflection and goes behind for a corner.

He perhaps should have hit that first time rather than running into traffic on the edge of the penalty box.

Chris Sutton
Former striker on BBC Radio 5 Live at Emirates Stadium

Sporting are the team that are playing with that belief and confidence in the final third. All the stuff Mikel Arteta said pre-match about purpose, fire and conviction. Well, Arsenal have certainly lacked conviction going forward.