James Tomkins could miss the rest of West Ham's season following a dislocated shoulder.
Just after Enner Valencia was counted out following a freak incident with a tea cup, the 25-year-old centre-back was counted out after a training ground accident.
He fell awkwardly and left the field in considerable pain on Thursday. He is now looking at 10 weeks on the sidelines but the full extent of the damage should be revealed by scans today.
Sam Allardyce's injury woes could be equally as excruciating. Winston Reid has a hamstring injury and won't be playing at the Emirates against Arsenal on Saturday and first-choice right-back Carl Jenkinson is an Emirates loanee which rules him out too. James Collins is the one fit centre-back
Cheikhou Kouyate may yet again have to step back from midfield to take up defensive duties with Alex Song retreating to take up his position against his former club.
The strike force is further depleted by ongoing injury problems with Carlton Cole and Andy Carroll.
In a statement, the club said: "West Ham can confirm that James Tomkins has suffered a dislocated shoulder. The 25-year-old was taken for hospital treatment and will continue to be assessed by the club's medical staff."