West Ham manager Slaven Bilic says the club will have to wait and see how serious Andre Ayew's injury is before making any plans moving forward.
Ayew suffered the injury as he chased after Chelsea forward Eden Hazard during the 2-1 defeat in the Premier League.
Ayew, 26, was making his first competitive start for the Hammers since joining from Swansea during the summer.
But the Ghana international was forced off after just 35 minutes at Stamford Bridge on Monday night.
Ayew suffered the injury as he chased after Chelsea forward Eden Hazard during the 2-1 defeat in the Premier League.Regarding Ayew's injury, Bilic has to wait for scan results before passing judgement.
"Ayew has a thigh injury," he confirmed.
"He told me it is not a big one, but you never know and he will have a scan on Tuesday and we have to wait for the result of the scan to know how long he will be out."
Bilic and his wounded squad will need to regroup quickly, as the Hammers travel to Romania on Wednesday for a UEFA Europa League play-off round first-leg tie with Astra Giurgiu on Thursday evening.