Senegal international Diafra Sakho has been influential throughout the Hammers' remarkable start to the campaign.
Already he has six goals to his name, having equalled the Premier League record for scoring in each of his opening six top flight starts.
Sakho scored what turned out to be the winner in West Ham’s 2-1 victory over Manchester City at the weekend, ensuring the side remain in the top four for at least another week.
|Team||Goals||Total Shots||Shot Accuracy (%)||Conversion Rate (%)||Apps||Mins|
|Diafra Sakho||West Ham||6||23||34.78||26.09||7||558|
However, the 24-year-old was forced off in the final minute of the Hammer's win over the Citizens with a shoulder injury.
He will go for a scan on Monday but, according to reports in The Mirror, he could be out for around a month with the problem.
Speaking of Sakho and striker partner Enner Valencia in his post-match interview, boss Sam Allardyce said:
"I don’t think Valencia and Sakho really know what they have done yet. They’ve just come here, they want to play football and I don’t think they realise what a big impact they have made.”
"But for me my biggest worry is that my leading goalscorer today came off with a shoulder problem towards the end and I sincerely hope that the damage is not severe and he recovers very quickly."
The West Ham star was taken to hospital on Saturday night after colliding with City keeper Joe Hart late on in the match.
Sakho's absence would be a huge blow for the Hammers, who also await the return of England striker Andy Carroll.