Benfica get themselves a corner but Gian-Luca Waldschmidt's cross is poor and Emile Smith Rowe heads clear at the front post.

Comfortable enough night for Bernd Leno so far.

Tottenham Hotspur

Spurs' Son Heung-min on playing at the Puskas Arena after winning the Puskas award for best goal of the year: "It's a big honour.

"Playing at this stadium – it’s massive. It's very special because I won the award for the last year.

"We got the win, that was more important than the special feeling. It’s very important we showed from minute one that we wanted to win, not only 1-0 or 2-0. We showed good attitude and scored three goals in the first half. The guys had a really good mindset."

On linking up with Gareth Bale: "I have a really close relationaship with him. I’m very happy he’s getting game time and scored a goal and got an assist. I really enjoy playing with him."

Benfica's back five are handling things when Arsenal don't play quickly enough.

Bukayo Saka creates a bit of space to curl a shot from distance, but it's comfortable for Benfica keeper Helton Leite.

Paul Carty: The lack of intensity in the knock outs of the Europa League vs those of the Champions League is stark to say the least.

David Luiz gets his body in the way to prevent Darwin Nunez getting an opportunity.

It's a tricky one this for Arsenal. Benfica are battling away, but the Gunners have already shown they can breach their back line and look much more likely to find the breakthrough.

Mikel Arteta is the unhappy manager now as Pierre-Emerick Aubameyang is flagged offside after Granit Xhaka takes too many touches before playing the striker through.

Oh how on earth has he missed that?

It's the man Arsenal would want such a chance to fall to, in Pierre-Emerick Aubameyang, but the skipper sends his shot wide of the post with the goal gaping.

Hector Bellerin's ball across the six-yard box put that on a plate. Unreal miss.

Image source, Getty Images

Manchester United

Manchester United manager Ole Gunnar Solskjaer to BT Sport: "We scored some good goals and played some nice football. We deserved to win but maybe not by four goals. On a night like this when we find spaces we can be a dangerous team.

"We had to defend well, they have some terrific players up front and we earned the right to counter-attack quickly. They opened up and we got the spaces we wanted.

"Every team attacks you, it's about finding the moments to find the space. We are a work in progress, we are learning and some games we have not been able to win lately."

How Arsenal would love to take control of this tie in the first leg as Tottenham and Manchester United have already managed this evening. A huge help in a season so congested as this one is.

There's no way through the Benfica back line at the moment...

Arsenal respond by going straight up the other end, but Dani Ceballos can't pick out a team-mate with his cross.

Leicester City

Leicester City manager Brendan Rodgers speaking to BT Sport: "I was really pleased from a defensive perspective. We kept them reasonably quiet. They had one opportunity at the back post in the first half but our goalkeeper and back four were strong. The pitch was heavy and it was a little bit of man-marking. I was delighted with the spirit and we were solid away from home. Hopefully it will be the case next week [we score goals at home].

"Jamie Vardy isn't always involved a great deal. He's a special player that relies on our midfield and wide players to get on the ball as he plays on the last line. He just needs those chances and that's why he's such a great striker. He got a good hour in his legs and will be fresh for the weekend.

"I thought the officials were very poor, I have to say. I don't comment on them much as it's a very difficult job but some of the decisions... It was clear it wasn't [an elbow from Kelechi Iheanacho for the yellow card] They were challenging for the ball. Overall, I didn't think it was a good night for them to be honest.

"When you come away it's important you defend well. You have to stay strong and be aggressive. We kept a clean sheet and we will look to the second leg. Now we have had a feel for them we can go away and look at where we can get through to the next round."

Benfica do get forward now, but Gian-Luca Waldschmidt's shot on the edge of the penalty area is quickly closed down.

Benfica boss Jorge Jesus is screaming at his players, who have found themselves under pressure pretty much since the first whistle.

Again, Arsenal regain possession in the middle of the park, which is as far as the Gunners are letting Benfica get so far.

Jeester101: Could be a bit early to call at this stage, but the chances of an all-English #UEL, external final are looking very good– depending on the Arsenal result later. Can see United, Spurs, Arsenal and one of AC Milan, Napoli or Roma in the semis.

Paul Scholes
Former Manchester United midfielder on BT Sport

Speaking on BT Sport...

Bruno Fernandes has been sensational since the day he signed. Every single game you feel he will score. He's been a truly terrific signing.

He knows where everyone is on the pitch, he has a picture in his head and he is capable of playing the killer pass every time.

Bukayo Saka isn't happy after he's brought down by Jan Vertonghen, as Arsenal continue to ask the early questions.

Dani Ceballos sends a cross in from the right which earns the game's first corner but Benfica's Nicolas Otamendi heads teh set-piece clear.

Manchester United

Manchester United midfielder Bruno Fernandes on BT Sport: "The result is pleasing, we want to win games. We did everything well. Still we have a tough game to play at home.

"We know 4-0 is a good result but we have to be aware of what they can do.

"I'll give Daniel James an assist for the second goal but he was trying to control it.

"My target is to score the most goals I can, that is my position. The only target is to win trophies."

A bright start by Arsenal.

Pierre-Emerick Aubameyang is on his toes and beats the defenders to a throughball before seeing the linesman's flag raised.

Arsenal have tonight named the same starting team in consecutive matches for the first time since September 2018, against Cardiff (won 3-2) & Newcastle (won 2-1).

Ready?

Let's begin.