Too much space. Goncalo Inacio is allowed to take a touch and tee himself up for a long-range effort. Matt Turner has to dive to push it behind for a corner.

First sniff of goal for West Ham but Manuel Lanzini pulls his shot wide from the edge of the box.

Ooh, Matt Turner's clearance is poor and it's straight to Sporting. Marcus Edwards almost slides in Paulinho but Turner reacts to make amends.

By the way, Sporting captain Sebastian Coates will miss the second leg in London after picking up that earlier booking.

His side are on the attack now but Paulinho can't pick out a team-mate when he chips it across the middle.

Oleksandr Zinchenko curls the free-kick into the wall and then fires the rebound straight back at the goalkeeper, which he tips over the bar.

Fabio Vieira is caught by Sebastian Coates, who has just been booked, on the edge of the Sporting area.

Sporting reacted angrily after conceding for something that happened off the ball in the build-up.

Oleksandr Zinchenko and Sebastian Coates have both been booked.

Image source, Getty Images

First bit of danger for West Ham as they concede three corners in quick succession.

Rafael Lopes heads over the third with a near-post flick on that wasn't far away.

From the following goal kick the visitors give the ball away and Gustavo Ledes sends an effort sailing over the Hammers crossbar.

Sebastian Coates is shirt-tight to Gabriel Martinelli, not allowing him any space when he's got the ball.

But he puts the goalkeeper under pressure to win a throw-in in the corner as Arsenal continue to dominate possession.

Sporting are seeing a bit more of the ball now but the game has settled. Both teams look well organised out of possession.

A pretty solid and unspectacular start for West Ham in Cyprus.

The Hammers are having marginally more possession but doing very little in an attacking sense.

Bayer Leverkusen and Roma are already 1-0 up against Ferencvarosi TC and Real Sociedad respectively.

Jose Mourinho's side looking to have success in Europe again.

Sporting deal with the set-piece but Arsenal are back at them shortly afterwards. Granit Xhaka tees up Fabio Vieira but his shot is blocked on the edge of the box.

Nice feet from Bukayo Saka but Gabriel Martinelli is under pressure when it comes to him on the edge of the box.

Arsenal retain possession though, and Martinelli then drives at the defence, winning a corner.

Dangerous move from Sporting as Jeremiah St. Juste bursts away down the right, overlapping Marcus Edwards.

He cuts it back into the middle but William Saliba is there to block it.