Jimmy Quinn has been banned from the touchline for his last game in charge at Lewes.
The Rooks boss will have to watch tomorrow's home game with Windsor and Eton from the directors' box.
Quinn, who is stepping down as manager after the game, has also been fined two weeks' wages.
Lewes have taken action following trouble in the recent home matches against Horsham and Worthing. This action also includes suspending one of Quinn's backroom team, Frank Smith.
A statement from the directors said: "Jimmy's behaviour fell short of the standard expected by the board and, as a result, it has been decided to fine him two weeks' wages. In addition, Jimmy will incur a touchline ban for Saturday's match.
"Frank Smith has been cited by Worthing FC as having racially abused Ben Carrington at the end of the Worthing match. As a result, Frank Smith is immediately suspended from all footballing activity at Lewes FC until the conclusion of the enquiry into these allegations. He may not enter the Dripping Pan ground nor participate in any training activities involving Lewes FC staff or players and he will not be allowed to attend the end of season presentation evening.
"The Worthing match was recorded on video and we believe that this may help to provide evidence in any official enquiry into the allegations against Jimmy Quinn and/or Frank Smith."
Quinn said: "I agree that I let the club down with my behaviour last Wednesday and I regret the incident happened but people who turn up for football don't have the right to abuse someone the way they did.
"I accept I have a responsibility as manager of the club and the club must deal with it like I would deal with any player who stepped out of line.
"We have a discipline code at the club and I accept I overstepped the mark."
Quinn insists his resignation has nothing to do with the recent trouble and he says he wants to go out with a win against Windsor.
The Rooks can clinch runners-up spot if they win and Bognor lose at Walton and Hersham, although they could not be promoted after the Ryman League refused them the A standard ground grading needed for premier division football.
The league said Lewes must have five permanent turnstiles rather than four but a fifth was installed by the club within 24 hours of the inspectors visiting and Lewes have lodged an appeal over this decision.
The search for a new manager will begin after tomorrow's game.
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