West Ham and Tottenham have each been fined £20,000 after they admitted an FA misconduct charge and accepted the standard penalty.
The clubs have been punished after Saturday's Premier League clash was marred by a late melee involving players from both sides.
Spurs won the derby 3-2 at the London Stadium, and the hosts were pressing for an equaliser in stoppage time when the players clashed after a foul by Hammers forward Andy Carroll.
The foul drew angry reactions from both sides, after which referee Michael Oliver booked Carroll and team-mate Winston Reid, plus Tottenham's Eric Dier and Fernando Llorente.
The FA confirmed in a statement on Thursday afternoon: "West Ham United and Tottenham Hotspur have each been fined £20,000, after they admitted an FA misconduct charge and accepted the standard penalty.
"It was alleged that in or around the 95th minute of their fixture on Saturday (23 September 2017), both clubs failed to ensure their players conducted themselves in an orderly fashion."
Before the sanction was confirmed, Hammers boss Slaven Bilic said the east London club were ready to take their punishment.
"We talked about it, but there was some pushing," the Croatian said at a pre-match press conference ahead of the Premier League match against Swansea.
"The FA can't have grey zones, so we have accepted the charge."