Preston and Chesterfield have been charged by the Football Association for players' conduct in the first leg of their League One play-off semi-final.
North End won 1-0 and eventually went through as 4-0 aggregate winners.
It is alleged that both clubs failed to control their players in an orderly fashion in the 28th minute.
Preston assistant Glynn Snodin has been charged with misconduct as it is alleged his behaviour during the first half amounted to improper conduct.
Both clubs and Snodin have until 18:00 BST on Friday, 15 May to respond to the charges.