Sheffield United and Watford have been charged with misconduct following a stormy ending to Sunday's Championship game at Bramall Lane.
It follows a confrontation between a large group of players in the closing moments of the match, which United won 1-0 thanks to an early own goal by Hornets keeper Daniel Bachmann.
Both clubs have been charged with failing to ensure their players did not behave in an "improper and/or provocative" way in the 94th minute and after the final whistle.
They have been given until Friday to provide a response to the Football Association charge.