John Ferguson has stepped down as chief executive and racing manager of Godolphin after calling his position "untenable".
Churchill heads the 11 horses declared for Tuesday's St James's Palace Stakes at Royal Ascot.
Horse Racing Ireland has approved a new two-day festival at Leopardstown in February.
Order Of St George will face a maximum of 17 rivals when he defends his Gold Cup at Royal Ascot next week.
Frankie Dettori will miss the entire Royal Ascot meeting with the arm injury he suffered last week.