Steve Bruce, 55, had reportedly wanted assurances about his role with Hull City, who put takeover talks on hold until September. The Tigers only have 13 fit players because of injuries. Bruce had an interview for the England job, although Allardyce has been chosen for that. His decision to quit is entirely unrelated, BBC Sport has learned.
He had been at the KC Stadium for four years, leading them to two promotions to the Premier League (with a relegation in between) and the FA Cup final.
The former Manchester United defender has managed Sheffield United, Huddersfield, Wigan (twice), Crystal Palace, Birmingham and Sunderland.
