Manchester United and Sheriff players are stood in the tunnel waiting for the nod from the Uefa timekeeper.
The visitors won't be fazed by playing at Old Trafford. They won at Real Madrid last season, remember.
West Ham manager David Moyes speaking to BT Sport on the importance of winning the group: "It's really important for us to do it because it makes life a lot easier for us. I have said all along to qualify was the main job and we have done that. We want to win tonight."
On Nayef Aguerd's first appearance of the season: "I expect you to see a player just coming back from injury and who hasn't played many games.