Former Hull manager Steve Bruce says he had to quit the newly-promoted Premier League outfit "for the sake of the club".
In an open letter to fans, Bruce says it has been a difficult 12 months and it was the right time for a new direction for the side.
Bruce resigned as Hull manager on Friday - just over two months on from winning promotion.
He was also interviewed for the England job before Sam Allardyce was appointed to replace Roy Hodgson.
In the open letter published in the Hull Daily Mail, he says that, "My biggest regret is having to walk away but it was a decision I had to make for the sake of the club. 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.
I desperately wanted to make it work this summer and be a Premier League manager again but, sadly, it wasn't to be. Nevertheless, I've left Hull City with some fantastic memories that I'll always cherish, including just eight weeks ago in the Championship play-off final at Wembley."
Ex-Everton and Wigan manager Roberto Martinez has been linked with the vacancy at Hull.
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