The ambitious Greek is keen to see the 'Tricky Trees' promoted to the Premier League this season following a summer of significant investment and opted to personally travel to Nottingham to pass on his opinion that the performances so far have not been good enough.
A home defeat to Norwich at the weekend means the club sit in ninth, six points behind leaders Middlesbrough, but it is thoguht that Marinakis sees the squad as being capable of competeing for automatic promotion.
Forest insists that the visit was arranged and was merely an opportunity for their owner to tour the training ground and stadium as well as speaking to club staff.
Manager Aitor Karanka is aware of the expectations and has previous for getting clubs out of the Championship having secured promotion with Middlesbrough back in 2015/16,