West Ham are in "disarray" and manager Slaven Bilic has "major surgery" to do to resolve their problems, says BBC pundit Chris Sutton.
Speaking after Sunday's 3-0 loss to Southampton, their fourth straight league defeat, captain Mark Noble said his side's defending was "laughable".
Noble added things "can't get any worse" for the Hammers, who are 18th.
"It's dark days for them and I can't remember such an abject display," Sutton said on BBC Radio 5 live.
West Ham only managed one shot on target against Southampton, who were comfortable winners thanks to goals from Charlie Austin, Dusan Tadic and James Ward-Prowse.
Thousands of home supporters left the London Stadium in the final 10 minutes, with swathes of empty seats visible at the final whistle.