Garry Cook has resigned as Manchester City's chief executive with immediate effect.

The board of the North West club accepted Cook’s resignation after allegations of an offensive email to the mother of Nedum Onuoha recently surfaced.

The Premier League club have confirmed that “foundations” have come to light behind the allegations, for which Cook has directly apologised.

The chief executive said in a statement: “I am privileged to have held my position at Manchester City Football Club and to have experienced the opportunities that it has presented. The privilege is in part offset however by the significant personal focus which has, at times, detracted from the magnificent achievements of those working at the football club.

“It is that factor, together with my error of judgement in this matter that has prompted me to reach this decision, which I believe is in the best interests of the football club.”

Chairman Khaldoon Al Mubarak added: “Garry has made a remarkable contribution to Manchester City Football Club over the past three years.

“His judgement in this matter should in no way lead to his accomplishments being overlooked. On behalf of Sheikh Mansour and the Board, I would like to thank him for his energy and tireless commitment to serving all those connected with the football club. He will always be welcome at Manchester City.”