Felipe Anderson has delivered West Ham an injury blow.
The Irons have been rocked by the loss of Anderson for four weeks — in a major blow to their survival hopes.
Tonight's Premier League trip to Leicester is the first of several games Anderson will miss as West Ham seek to claw themselves away from the drop zone.
Moyes said: “Felipe has a problem with his back, it is going to keep him out for a while. It looks about four weeks."