90' Pedro Obiang (West Ham United) goes for goal but the shot is blocked by an alert defence.
90' That's full-time at London Stadium. The final score is 3 - 0.
90' 3 minutes will be added to the second half in London.
89' Mohamed Elyounoussi is back on his feet again.
89' Corner awarded to Southampton FC.
88' Stuart Attwell has blown to resume play in London.
87' Play has been interrupted briefly in London to check on Mohamed Elyounoussi, who is grimacing with pain.
86' Marko Arnautovic for West Ham United gets in a strike but fails to hit the target.
83' West Ham United are coming forward and Marko Arnautovic gets in a strike, it misses the target, however.
83' The home team replace Manuel Lanzini with Lucas Perez.
80' Oriol Romeu is booked for the away team.
79' Stuart Attwell blows against Southampton FC's Nathan Redmond for offside.
78' Manuel Pellegrini (West Ham United) is making a second substitution, with Carlos Sanchez replacing Mark Noble.
75' Oriol Romeu is replacing Mario Lemina for the away team.
74' West Ham United's Jack Wilshere gets his shot away but it misses the target.
72' It's now 3 - 0 in London as Ryan Fredericks scores for West Ham United.
71' Southampton FC push forward at London Stadium and Mario Lemina gets in a strike. This is blocked, however, by a determined West Ham United defence.
69' Marko Arnautovic (West Ham United) is given an opening but the shot is blocked by a defender.
69' Great finish from Marko Arnautovic to give West Ham United a 2 - 0 lead.
68' West Ham United make their first substitution with Jack Wilshere replacing Grady Diangana.
68' Corner awarded to West Ham United.
68' The away team replace Stuart Armstrong with James Ward-Prowse.
67' Manuel Lanzini of West Ham United gets in a strike, but is off target.
65' Southampton FC have been awarded a corner by Stuart Attwell.
64' Jan Bednarek for Southampton FC gets in a strike but fails to hit the target.
64' Southampton FC's Nathan Redmond is on target but unsuccessful.
64' Southampton FC have been awarded a corner by Stuart Attwell.
63' Manuel Lanzini (West Ham United) has received a yellow card from Stuart Attwell.
63' Nathan Redmond (Southampton FC) is given an opening but the shot is blocked by a defender.
59' Shane Long (Southampton FC) gets in a strike but the shot is blocked by a defender.
51' Southampton FC's Nathan Redmond breaks free at London Stadium. But the strike goes wide of the post.
51' Corner awarded to Southampton FC.
51' Southampton FC have been awarded a corner by Stuart Attwell.
47' Corner awarded to Southampton FC.
46' Important block from the West Ham United defence as Nathan Redmond fires in a strike for Southampton FC.
46' Nathan Redmond is on a sub for Danny Ings for Southampton FC.
46' The second-half has started.
45' The first-half is over at London Stadium.
45' West Ham United's Michail Antonio gets in a shot on goal at London Stadium. But the effort is unsuccessful.
45' The fourth official's board shows 1 minutes, which will be added to the first half.
41' In London, Stuart Armstrong of Southampton FC is presented with a shooting opportunity. But the strike is blocked by the covering defence.
40' Southampton FC push forward at London Stadium and Shane Long gets in a strike. This is blocked, however, by a determined West Ham United defence.
38' Corner awarded to Southampton FC.
34' In London West Ham United attack through Ryan Fredericks. The finish is off target, however.
30' Michail Antonio of West Ham United smashes in a shot on target. The keeper saves, though.
22' In London West Ham United drive forward through Grady Diangana. His shot is on target but it's saved.
22' West Ham United's Manuel Lanzini gets in a shot but it is blocked by a Southampton FC defender.
21' West Ham United are caught offside.
16' Mark Noble instrumental with a fine assist.
16' West Ham United take a 1 - 0 lead thanks to Marko Arnautovic.
14' Southampton FC's Mohamed Elyounoussi misses with an attempt on goal.
12' Marko Arnautovic (West Ham United) goes for goal but the shot is blocked by an alert defence.
11' Important block from the Southampton FC defence as Grady Diangana fires in a strike for West Ham United.
11' West Ham United are too eager and fall into an offside trap.
10' West Ham United are whistled for offside.
10' West Ham United have been awarded a corner by Stuart Attwell.
8' West Ham United are pushing forward but Grady Diangana's finish is wide of the goal.
6' Southampton FC are coming forward and Danny Ings gets in a strike, it misses the target, however.
1' The whistle has gone to start the match.
Today's match is followed by 59961 spectators.
Manuel Pellegrini and Ralph Hasenhuttl have now revealed their starting line-ups.