West Ham captain Mark Noble has pleaded with supporters not to repeat the crowd trouble which marred the defeat by Burnley.
Angry fans invaded the pitch and congregated below the directors' box to protest against the club's owners David Gold and David Sullivan, with the latter being struck by a coin.
West Ham's 3-0 loss plunged them closer to the relegation zone and they face a crucial clash with Southampton at the London Stadium on Saturday.
A further protest has been planned outside the ground before kick-off, but Noble has urged the fans to get behind the team during the match or face the prospect of dropping into the Championship.