Marinakis, who has not enjoyed the Premier League season with Forest as much, could soon be a trophy winner.
The Greek businessman also owns Olymipakos, who beat Aston Villa in the Conference League semi final first leg.
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Olympiakos' Ayoub El Kaabi was the most impactful player for the Greek side, who won 4-2 in Birmingham.
Marinakis has owned Olympiakos since 2010, while he has been Forest owner since 2017.
He will be hoping that his Forest side can avoid relegation from the Premier League this term.