Steve Bruce has thanked Hull City fans for their “unwavering” support and says he resigned as manager on Friday “for the sake of the club”.
Bruce joined the Tigers in 2012 and led them to promotion to the Premier League twice and also an FA Cup final.
His resignation followed a breakdown in his relationship with vice-chairman Ehab Allam.
“It was a decision I had to make for the sake of the club,” he said in an open letter.
“The last 12 months have been very tough and it felt like the right step for the club to move forward in a different direction and with someone else in charge.”
Hull’s owners put plans to sell the club on hold on Wednesday to “ensure stability in the transfer window”, with the senior squad reduced to only 13 fit players.
Bruce continued: “It is rare for a manager to have the backing I’ve had from fans. It’s been unwavering.
“One of the abiding memories was the reaction of supporters the day we were relegated on the final day of the 2014-15 season.
“They applauded us off the pitch when you’d expect them to have been ripping the roof off.”