Sunderland are considering an appeal after assistant head coach Jamie McAllister was hit with a six-game ban for his role in the Tunnelgate clash with Oxford United last month.
McAllister and Oxford boss Karl Robinson - along with both clubs - were both charged by the FA following the explosive encounter at the Stadium of Light on Good Friday.
Players and staff from both clubs were involved in a confrontation in the tunnel at half-time, and again at full-time, with Robinson claiming that his goalkeeper Jack Stevens had been headbutted by one of the Sunderland contingent in the fracas at the interval.
The FA has yet to confirm any sanctions, but Oxford announced today that Robinson has been fined and handed a four-match touchline ban for his part in events at full-time, and he was absent from the bench for his side's game against Burton Albion today.
McAllister was not at the Stadium of Light today and, while there was no explanation before the game, afterwards Johnson revealed that his longtime assistant had been given a six-game ban, comprising a three-game stadium ban and a further three-game touchline ban, although the club may appeal against that penalty.
The bans for Robinson and McAllister mean they will be absent from the dugout for entirety of their sides' play-off campaigns, and any remaining games will be served next season.
Johnson said: "Jamie McAllister has got a six-game ban.
"The situation as it stands is that he has got a six-game ban, three of those [games] are stadium bans and three of those [game] are touchline bans.
"We have got the opportunity to appeal and our early thought process is that we will do that.
"Obviously you have to have grounds to appeal and we believe we have, we believe it is unjust, but we have to put our case and our argument forward."
In a statement, Oxford said: "The club accepts the punishment but wish to state publicly its support for Karl, the staff and the players over this incident."
Of his touchline ban, Robinson added: "I'm proud of my players and will always back them, as will all of the staff.
"What happened at Sunderland should never have got to that stage.
"I wanted the police called because of an incident at half time, not of our making, that sparked what happened later.
"Had that happened then events after the final whistle would have been very different.
"I won’t apologise for the staff and players caring and looking after each other but in a very long season it was just one fleeting moment where the passion we all have for this club spilled over.
"As far as we are concerned the incident is now closed.
"We move on and we prepare for today’s game in our usual calm, professional manner."
Both clubs were also charged with failing to control their players at half-time and full-time, with Oxford saying they have been fined for that but without specifying the amount.
Sunderland have not said whether or not they have been fined for that offence.
Robinson was also sent to the stands late on in the game against Sunderland for aiming a verbal volley at referee Trevor Kettle, and he has already been fined £1,000 and has served a one-match touchline ban as a result of that separate transgression.
