Great defending Shkodran Mustafi! Credit where it's due. The German has to be at full stretch to slide in and cut out a cross from Kostas Tsimikas which looked likely to give the Greek visitors a great opening.

Eddie:Good passage of play from Arsenal. Ozil giving Bellerin an early chance there to stretch his legs.

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Chance for Romelu Lukaku...

Good break by Inter Milan and the former Manchester United man goes knocking on the Ludogorets door - but goalkeeper Plamen Iliev just about keeps Lukaku's effort at bay.

Daniel James tries to find Odion Ighalo with a cross from the left but a Club Bruges defender heads away.

Manchester United then try to go through the middle as Bruno Fernandes looks for the one-two with Juan Mata but Fernandes can't get to the return pass in time.

Olympiakos try to catch out Arsenal with a quick ball into the box but Mathieu Valbuena isn't quick enough to react and Bernd Leno gathers.

Another strong run by Juan Mata earns Manchester United a corner as his cross is deflected behind. The delivery from the set piece is not quite as good, however, as Club Bruges head away.

Andy: How on Earth is the Man Utd game not 4-2 after 12 mins?

First real attack of note for Arsenal as Nicolas Pepe cuts inside but his shot is blocked.

But Manchester United go straight up the other end and Simon Mignolet does well to stop Bruno Fernandes' fierce effort.

Belting start to this game.

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What an opportunity for Club Bruges!

Hans Vanaken crosses from the left, Sergio Romero punches but straight to Mats Rits who volleys over with Romero out of the picture.

Let off for Manchester United.

Olympiakos are passing the ball around quite nicely as they look to try and open Arsenal up and get an early goal. A great ball out wide finds Lazar Randjelovic but he can't find a way past Bukayo Saka.

Manchester United have Club Bruges pegged back on the edge of their own area as Juan Mata again picks out Odion Ighalo inside the box. The ball flicks up off his boot and he tries to juggle it through the defence but the visitors deal with the danger.

Emlyn Begley
BBC Sport at Old Trafford

Electric start at Old Trafford with Odion Ighalo almost getting on the end of several things before Bruno Fernandes crashes one off the post. United fans are enjoying the opening moments.

Not quite the same level of excitement at the Emirates, however, with possession largely being exchanged in midfield.

It promises to be a strange atmosphere at San Siro, where Inter Milan are hosting Ludogorets behind closed doors because of the coronavirus outbreak.

This was the Ludogorets team bus arriving at the stadium a little while ago.

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Antonio Conte's Inter lead 2-0 from the first leg. Victor Moses, Romelu Lukaku, Christian Eriksen and Alexis Sanchez all start.

And now Simon Mignolet pushes Bruno Fernandes' effort onto the post.

Relentless!

Simon Mignolet punches away from above Odion Ighalo's head as Manchester United come forward again. Moments later, Mignolet does well to punch away Juan Mata's fierce drive before the visitors almost capitalise on a mistake at the back by Harry Maguire.

What a start to this game!

There's a huge roar as Juan Mata immediately finds Odion Ighalo inside the box but he can't get past his marker and Club Bruges clear.

Just got under way at Old Trafford and getting under way elsewhere.