West Ham United's Diafra Sakho with manager Slaven Bilic
After missing the first three months of the season through injury, Sakho was handed a shock start away at Tottenham Hotspur last weekend, and was again included in Bilic's starting line-up at Manchester United on Sunday.
With the Senegalese striker fighting for his future, he impressed against Manchester United, scoring the opening goal inside the first two minutes and putting in a strong display up front on his own.
Tottenham's Danny Rose in action with West Ham's Diafra Sakho
However, Sakho was substituted on 66 minutes with a hamstring injury, and West Ham fans have been concerned about his status given that he is now the only Hammers striker to have scored a league goal this season.
Now, The Mirror report that Sakho will undergo a scan today – but West Ham fear that he will be ruled out for four weeks in what would be a major blow for Bilic.
Diafra Sakho celebrates scoring for West Ham
West Ham attempted to land players to boost their strike force over the summer, but Simone Zaza and Jonathan Calleri have yet to find the net, and Sakho's return to scoring form was a massive boost to the struggling Hammers.
However, Bilic may have to go back to the drawing board up front, with Sakho now set to be ruled out, and target man Andy Carroll still working his way back from an injury picked up after the first game of the season.
How much do you think West Ham will miss Sakho?