Nottingham Forest owner Nigel Doughty was found dead at his home yesterday.
The club said Doughty was found in the gym at his Lincolnshire house.
"It is with enormous sadness that Nottingham Forest announce the death of the club's owner Nigel Doughty," the club said in a statement.
"Mr Doughty, who was 54, was found dead earlier today in his gym at his home in Skillington, Lincolnshire.
"The club would like to appeal for the privacy of Mr Doughty's family to be observed at this sad time.
"The club will be making no further comment."