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

It is not clicking, and it is not connecting, but this is not a one-off. That would be the worry for Arsenal fans as this is how they have looked up top in recent weeks. I feel they are missing Saka massively - they are not quite the same team. The longer this goes on and if Sporting do get a goal, nothing would surprise you. It is a big half-time team talk from Mikel Arteta.

Kylian Mbappe is the first player ever to score 10 away goals in a single European Cup/Champions League season.

The French forward has 15 goals this campaign - only Cristiano Ronaldo has ever netted more in a single season of the tournament (17 in 2013-14, 16 in 2015-16).

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

A very nervy half from Arsenal, who still have plenty to do. You would have to say as an attacking display it was boring, boring Arsenal. Sporting looked the more likely team to score. This is a nervy stadium. It has been a nervous Arsenal performance.

Stephen Warnock
Former Liverpool defender on MOTD: Uefa Champions League

What a wonderful first half.

Aaaaand breathe.

What a game of football.

Image source, Reuters

Stephen Warnock
Former Liverpool defender on MOTD: Uefa Champions League

This game is wide open - these two teams just cannot defend.

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

Has this been a vintage defensive display? No it has not.

Has it been incredibly entertaining? Yes it has.

Everything to play for in the second half. Arsenal are struggling to create anything and still have serious work to do.

Image source, Getty Images

Steven Gerrard
Former England and Liverpool captain on TNT Sports

You ask your full-backs to be so aggressive in possession, you give the ball away and turn it over, then you are so vulnerable at the back to Vinicius Jr and Kylian Mbappe. It's so dangerous because they can kill you.

I can't understand - if you are Bayern, and you have full control and are in front, why would you want your full-backs to be so gung-ho at all times. Keep them at home.

Josip Stanisic was down on the turf while that attack was happening and the Bayern players are seething. They don't think that attack should have happened.

Vincent Kompany goes into the referee's book, presumably for sharing his thoughts on the situation. Should Bayern reach the semi-finals the Belgian manager will have to watch from the stands.

Ally McCoist
Former Rangers striker on TNT Sports

It's good, Catamo keeps it down but the way it's spinning it just goes away from the goal and hits the post.

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

Geny Catamo was turning away as if he had scored and it comes off the post. How unlucky were Sporting there?

Alex Howell
BBC Sport Arsenal reporter at Emirates Stadium

A huge let-off for Arsenal there. Catamo hits the post with a great effort and there's a collective groan around the Emirates.

It's started to get a little bit nervy.

Arsenal are living dangerously. They need the half-time whistle...NOW!

This tie if far from done.

Sporting will be so disappointed they didn't take advantage of that David Raya mistake.

But what's this?

A first-time shot by Geny Catamo comes back off the post after the Gunners are caught cold at the back.

Vinicius Jr tries his luck from range he's hit that with venom!

What a brilliant strike that is and he's denied only by the woodwork.

Eder Militao and Josip Stanisic both go into the referee's book.

Some frustrations starting to boil over.

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

That's a big chance missed from Sporting. It is a strange game, isn't it?