West Ham United joint chairman David Sullivan has stepped down from his position with immediate effect after learning of the impending publication of historical allegations concerning his personal life.

Sullivan announced his resignation as joint chairman and director of the Premier League club after being made aware that serious historic allegations were set to be broadcast or published. The nature and specific details of these allegations have not been disclosed by the club or Sullivan.

In his statement, Sullivan strongly denied the allegations, describing them as "factually incorrect and entirely false" and referring to them as "decades-old allegations." He characterized the claims as concerning his personal life rather than his professional role at West Ham.

The resignation takes effect immediately, marking the end of Sullivan's tenure as joint chairman of the East London football club. Sullivan had been a key figure in West Ham's ownership structure and had been involved in major decisions regarding the club's operations and player transfers.

West Ham United has not provided additional comment beyond confirming Sullivan's departure. The club will need to address the leadership change as it continues its current Premier League campaign.