Sheffield United and Southampton have been charged with failing to control their players after tempers flared late on in the Saints' 2-0 win at Bramall Lane on Saturday.
The incident came in the first of three minutes added on when United's John Fleck fouled Che Adams, the ex-Blade who was on the scoresheet in Southampton's win.
Fleck was shown a yellow card for the challenge, checked by VAR, but Saints players surrounded referee Paul Tierney demanding more, with United's Oli McBurnie and Southampton's Jannik Vestergaard booked for their reactions.
An FA statement said: 'It is alleged that both clubs failed to ensure their players conducted themselves in an orderly fashion during the 90th minute and they have until Monday (15/3/21) to respond.