Delacroix was installed as ante-post favourite after winning two Derby trials at Leopardstown and has been confirmed as the mount of stable jockey Moore.
Colin Keane will partner The Lion In Winter, who was sixth when odds-on favourite in the Dante, and is expected to improve for that run although has been drawn widest of all in 19.
Stablemate Lambourn, the Chester Vase winner, will break from 10 – where 11 previous winners have started since stalls were introduced in 1967.
William Buick will partner Ruling Court from stall seven as the jockey and trainer Appleby seek further Classic success, having also landed the 1000 Guineas with Desert Flower, who is favourite for the Oaks on Friday.
Tornado Alert, fourth in the 2000 Guineas, represents fellow Godolphin trainer Saeed bin Suroor.
As well as Nightwalker, owners Juddmonte have added French challenger New Ground to the £1.5m race for a supplementary fee of £75,000.
The Francis Graffard-trained Midak has also been added to the race and he will carry the colours of the Aga Khan Studs, with the race run in honour of the Aga Khan IV, who owned legendary Derby winner Shergar and died in February.
Charlie Johnston is double-handed with Lazy Griff and Green Storm, with Al Wasl Storm, Nightime Dancer, Rogue Impact, Sea Scout, Tennessee Stud and Tuscan Hills completing the field.
Approximate Oaks odds (Friday 16:00 BST): 13-8 Desert Flower, 9-2 Minnie Hauk, 6-1 Whirl, 8 -1 Giselle, 9-1 Elwateen, 11-1 Revoir, 16-1 Bar.
