Like Palace, Forest were also at risk of falling foul of Uefa's multi-club ownership rules because Marinakis also controls Greek side Olympiakos.
In the European governing body's rulebook, a club must prove they are not "simultaneously involved in any capacity whatsoever in the management, administration, and/or sporting performance of more than one club participating in a Uefa club competition".
The 58-year-old Marinakis avoided any potential punishment
by diluting his control of the Premier League side, a step which was announced in April, when there was the possibility of both teams qualifying for the Champions League.
Ultimately, there were no sanctions to avoid and no case to answer for Forest, because they fell short in their Champions League challenge and are therefore not in the same competition as Olympiakos.
In June, Marinakis effectively regained control and disbanded the blind trust he had set up to oversee club matters.
Companies House files show that the three directors appointed at Forest at the end of April were all terminated from the roles on 6 June.