The FA handed Marinakis a five-match stadium ban last month for improper behaviour during Forest's 1-0 home loss to Fulham on September 28th.
Marinakis appealed having been found guilty by a regulatory commission for spitting towards match officials around the tunnel area after full-time.
The commission explained the reason for Marinakis' ban earlier, saying there was "no excuse" for such an "an egregious display of disrespectful behaviour" that could "fuel disrespect towards match officials."