Marinakis was enraged by what he perceived as unjust calls that favored Fulham in a close 1-0 defeat for his team in September.
In publishing its written reasons behind the decision, an independent commission stated they had to set an example.
Per the investigation, Marinakis "deliberately spat in a disrespectful and disgusting display of contempt towards the match officials.”
Marinakis argued a ban from the tunnel and dressing room was sufficient, but he has to stay away from games.