What time does it start?
The match will kick off at 7.45pm on Wednesday 5 April.
Where can I watch it?
It will not be shown live on television in the United Kingdom.
Highlights will be shown on BBC One at 10.45pm.
Laurent Koscielny will be unavailable for Arsenal after sustaining an Achilles injury in Sunday’s draw with Manchester City.
Alex Oxlade-Chamberlain and Aaron Ramsey could return after recovering from calf and hamstring problems respectively.
Michail Antonio and Diafra Sakho are in contention for the visitors but Aaron Cresswell is unavailable.
West Ham 1 Arsenal 5
Premier League, December 2016
West Ham 3 Arsenal 3
Premier League, April 2016
Arsenal 0 West Ham 2
Premier League, August 2015
West Ham: DLLLL
Provided by 888.com
West Ham: 7/1