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
Source : PA