The Senegalese striker headed the Hammers in front at Old Trafford when he nodded home Dimitri Payet’s free-kick to give Slaven Bilic’s side the lead.
The striker then picked up an injury in the second half which turned out to be a hamstring problem and he is now awaiting a scan.
Having only just returned to the side after a back injury kept him out for the entire season it is the last thing the striker wants. He is almost certain to miss the EFL quarter-final clash against the same opposistion on Wednesday as Bilic’s men face another trip to Old Trafford.
Oli McBurnie and Barry Douglas are set to be named in Alex McLeish's first Scotland squad in more than a decade.
Nottingham Forest and Derby cancelled each other out as the City Ground witnessed the first 0-0 draw between the two rivals in more than a century in the league