Leeds United also confirmed the news on their website, stating: "Leeds United wishes to place on record our appreciation for the honourable manner in which Aston Villa have conducted their interest in the player. The club has resisted approaches from other FA Premier League clubs since agreeing terms with Aston Villa. Having given Villa our commitment to transfer the player (subject to a medical), we had no intention of going back."
Bradford-born Delph, 19, made his England U-21 debut last year - his only cap at that level to date - and was Leeds' players' player of the year and young player of the year last season.