Sporting take the tempo back down to walking pace momentarily as both teams look grateful for a breather.

We're back to square one with both teams level again.

Joe Gibney: Sporting vs Arsenal could be a goal every 5 minutes, all sorts going on, but unmissable.

Fabio Vieira leaps to meet the cross from the left and his header is tipped over by Adan.

Relentless.

Mikel Arteta makes a change. Takehiro Tomiyasu is on for Oleksandr Zinchenko.

West Ham boss David Moyes looks like he's happy with the way things are going here and decides to freshen things up a bit.

On come Jarrod Bowen, Tomas Soucek and Gianluca Scammaca as Pablo Fornals, Declan Rice and Said Benrahma trot off for a rest.

It's all happening now.

Paulinho should score another. He's played clean through with only Matt Turner to beat but he curls it wide and high.

Wow. It's very open now.

Gabriel Martinelli almost scores an incredible solo goal!

He runs all the way from the halfway line, bustling through several challenges and going around the keeper before St Juste sprints back to make a crucial, goal-saving last-ditch challenge.

Corner to Arsenal as Sporting celebrate St Juste's tackle as if they have scored.

Marcus Edwards has it at his feet again, weaving in and out as he cuts in from the right.

He has space to shoot but holds onto it too long. Fabio Vieira wins it and breaks for Arsenal before he's taken out by Hidemasa Morita.

Morita gets a yellow card for it so he'll also miss the second leg, along with Sporting captain Sebastian Coates.

Sporting still carry a threat and they almost make it count.

They break through the middle, it comes to Marcus Edwards and he drills it across the six-yard area.

William Saliba dives to intercept.

Arsenal have got a real zip about them now. Granit Xhaka combines with Oleksandr Zinchenko and he picks out Gabriel Martinelli. The header on the stretch is over the bar.

Reiss Nelson slides it through to Fabio Vieira and Adan has to race off his line to make the clearance.

Inches again!

Fabio Vieira is teed up by Gabriel Martinelli on the edge of the box but he drills it just wide of the right post.

Chances falling quickly at the start of this second half.

Almost 2-1!

Oleksandr Zinchenko smartly pokes it through to Gabriel Martinelli, slicing open the backline and deceiving Sporting.

Martinelli waits for goalkeeper Adan to run off his line and tries to chip him but it's an excellent save from close range.

Image source, Getty Images

Almost a third for West Ham and Michail Antonio but the forward sees a low effort hit the inside of the post and stay out.

Great play by Francisco Trincao down the left for Sporting. He chops in and out, whips a pacey cross in which Matt Turner has to punch away, then Morita pokes it back at the Arsenal goalkeeper and he holds on to it.

Getting back under way in Portugal and Cyprus. Michail Antonio has given West Ham a strong lead. Can Arsenal get themselves back in front?

Image source, BBC Sport

Manchester United manager Erik ten Hag names exactly the same starting XI from the 7-0 Premier League humbling at Liverpool last Sunday.

Man Utd XI: De Gea, Dalot, Varane, Martinez, Shaw, Casemiro, Fred, Antony, Fernandes, Rashford, Weghorst.

Subs: Heaton, Butland, Lindelof, Maguire, Malacia, Sancho, Pellistri, Wan Bissaka, Elanga, McTominay, Garnacho, Mainoo.

Real Betis make four changes to the side that drew against Real Madrid in La Liga last Sunday. Joaquin comes in to captain the side, while Juanmi, Luiz Henrique and Abner Vinicius also start.

Real Betis: Bravo, Sabaly, Pezzella, Felipe, Vinicius, Carvalho, Rodriguez, Henrique, Joaquin, Juanmi, Perez.

Subs: Gonzalez, Ruiz, Iglesias, Canales, Willian Jose, Rui Silva, Guardado, Ruibal, Martin, Sanchez, Miranda, Guerrero.

Simon Stone
BBC Sport at Old Trafford

In a kind of 'you got us into this mess, you get us out of it' move, Manchester United boss Erik ten Hag has gone with the same starting line-up that began Sunday's seven-goal trouncing at Liverpool.

Bruno Fernandes is captain.

Full team news to follow.