Marinakis wants to be assured the players are responding and playing for manager Ange Postecoglou, with the Australian yet to taste victory in his first six games in charge.
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BBC Sport says Marinakis and his board are united behind Postecoglou going into Sunday's game, but the owner wants to see the players show they are behind the manager's tactics and methods.
Forest captain Morgan Gibbs-White was full of praise for Postecoglou in midweek and teammates have spoken of the standard of training employed by the manager and his staff.
But Postecoglou needs a result on Sunday to assure Marinakis, with Forest fans already turning on the new appointment.