Watford and West Brom __have both been fined £45,000 by the Football Association after admitting a misconduct charge.
The two clubs were disciplined for failing "to ensure their players and/or officials conducted themselves in an orderly fashion and/or refrained from provocative behaviour".
The incident occurred in the 84th minute of their Premier League meeting on December 3.
Watford's Roberto Pereyra reacted angrily to a challenge by West Brom winger James McClean, leading to a melee that brought both managers onto the pitch.
Pereyra was sent off, although he subsequently had his ban reduced from three games to one game.