West Ham and Tottenham have each been fined £20,000 by the Football Association after admitting a misconduct charge for failing to control their players in last Saturday's Premier League clash.
Spurs won the derby at the London Stadium 3-2, but almost squandered a three-goal lead and the Hammers were pressing for an equaliser in stoppage time when a late melee occurred.
Five players were cautioned by referee Michael Oliver.
West Ham's Andy Carroll, Winston Reid and Andre Ayew were shown yellow cards, while Eric Dier and Fernando Llorente were booked for Spurs.
The incident - which prompted the charge from the governing body that "both clubs failed to ensure their players conducted themselves in an orderly fashion" - came after a foul by Carroll which drew angry reactions from both sides and saw four players booked.
Ayew's caution for a foul had come earlier in stoppage time.
The visitors were under pressure after being reduced to 10 men with 20 minutes remaining when Serge Aurier received a second yellow card.
Javier Hernandez had reduced the Hammers' deficit to two goals five minutes earlier and Cheikhou Kouyate's goal three minutes from time gave the hosts hope of a point which never materialised.
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 (areas), so we have accepted the charge."