Fabio Vieira is caught by Sebastian Coates, who has just been booked, on the edge of the Sporting area.
YELLOW CARDS
Sporting Lisbon 0-1 Arsenal
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.
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.