West Ham forward Diafra Sakho is set for at least four weeks on the sidelines with a thigh injury.
Sakho limped out of the 1-1 draw at home to West Brom last Sunday with what the London club described as a "significant injury to his left thigh".
And speaking in a media conference ahead of the away game against Manchester United this Saturday, West Ham manager Slaven Bilic said: "Diafra Sakho, we are still waiting for the results of his scan, but it will definitely not be a couple of weeks - four to eight, maybe longer.
"We are waiting for the opinion of a couple of specialists. He has a bit of history with that thigh. It's not a light one unfortunately. Of course it's a big blow. We are not bad in terms of quantity of injuries, but unfortunately they have happened to key players."
Bilic added: "Enner is having a good recovery so hopefully we will have him in a couple of weeks' time. It's a good chance for the guys to step in."
