Marinakis also owns Olympiakos, who are 13 points clear at the top of the Greek Super League and set to compete in the Champions League next year.
His decision to accede control at Forest comes in light of the UEFA ruling that bars clubs under the same ownership group from competing in the same European competition.
Documents filed to Companies House showed the Greek businessman will be “ceasing to be a person of significant control” at the Premier League side, with his club shares being put into a blind trust.
Meanwhile, former Arsenal sporting director Edu is set to lead Marinakis’ multi-club group that also includes Brazilian side Rio Ave. Edu stepped down from his role at Arsenal in Novemeber 2024 after five years at the club.
