Michail Antonio is due for a scan on his hamstring after pulling up with an injury in the Carabao Cup against Newport County.
Antonio had to come off against the League Two outfit after just eight minutes, and now West Ham are worried he could be out for a lengthy period of time.
West Ham manager Manuel Pellegrini spoke on the matter, with the Daily Mail quoting him as saying: "He has a hamstring injury, we will see.
"We have the international break after the game on Saturday so after 15 days we will see how big the injury is and we will know how long he is out for.